<Tr> <Td_colspan="6"> <P> While Dr. Smith, Penny and Will conduct a play, a sickly alien named Arcon appears and begs for help . Penny takes him back to the Jupiter 2 to rest, but soon a trio of aliens called the Saticons appear and demand Arcon surrender to them . Penny refuses to betray her new friend and the Saticons turn down the heat in an attempt to freeze the Robinsons to death . Arcon decides to leave, but he gives Penny his magic belt for safekeeping. Smith then goes to the Saticons to inform them that Arcon has left, but the aliens know Penny has the belt and offer Smith the use of their molecular transporter to beam himself back to Earth if he gets it for them . Smith schemes to hand off a forgery of the belt instead, but unbeknownst to him, the aliens really plan to transport him to a duplicate of San Francisco's Chinatown on a lifeless asteroid . </P> Guest stars: John Carradine (Arcon), Jim Mills (Saticon #1), John Hunt (Saticon #2 / (uncredited), Paul Kessler (Saticon #3 / uncredited), Harry Monty (Monster Fly / uncredited), Judy the Chimpanzee (Debbie the Bloop / uncredited) </Td> </Tr> <P> While Dr. Smith, Penny and Will conduct a play, a sickly alien named Arcon appears and begs for help . Penny takes him back to the Jupiter 2 to rest, but soon a trio of aliens called the Saticons appear and demand Arcon surrender to them . Penny refuses to betray her new friend and the Saticons turn down the heat in an attempt to freeze the Robinsons to death . Arcon decides to leave, but he gives Penny his magic belt for safekeeping. Smith then goes to the Saticons to inform them that Arcon has left, but the aliens know Penny has the belt and offer Smith the use of their molecular transporter to beam himself back to Earth if he gets it for them . Smith schemes to hand off a forgery of the belt instead, but unbeknownst to him, the aliens really plan to transport him to a duplicate of San Francisco's Chinatown on a lifeless asteroid . </P> <Table> <Tr> <Th> No. in series </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> </Tr> <Tr> <Th> 60 </Th> <Td> </Td> <Td> "Condemned of Space" </Td> <Td> Nathan Juran </Td> <Td> Peter Packer </Td> <Td> September 6, 1967 (1967 - 09 - 06) </Td> </Tr> <Tr> <Td_colspan="6"> <P> A comet threatens to impact the Robinson's planet and the family is forced to make a hasty escape in the Jupiter 2 . Once in flight, Dr. Smith fools with the airlock controls and accidentally sends The Robot into space . Next, the Jupiter 2 docks with an alien spaceship and the Professor and Major West venture inside and reunite with the Robot . They soon realize the ship is an automated prison filled with alien felons in suspended animation . Once again, Smith tampers with controls he doesn't understand and releases a dangerous prisoner who tries to free the other inmates and take over the ship . Guest stars: Marcel Hillaire (Phanzig), Duke Fishman (Convict / uncredited), Ben Frommer (Convict / uncredited), Eldon Hansen (Robot Guard / uncredited), Lars Hensen (Convict / uncredited), Mike Morelli (Convict / uncredited), Gil Perkins (Convict / uncredited), Robby the Robot (Robot / uncredited) </P> Note: This was the first episode featuring a live action opening credit sequence accompanied with new theme music and to conclude with a teaser of highlights from the next week's episode rather than the previous two seasons cliffhanger freeze style conclusion . </Td> </Tr> <Tr> <Th> 61 </Th> <Td> </Td> <Td> "Visit to a Hostile Planet" </Td> <Td> Sobey Martin </Td> <Td> Peter Packer </Td> <Td> September 13, 1967 (1967 - 09 - 13) </Td> </Tr> <Tr> <Td_colspan="6"> <P> The Jupiter 2 is caught in a space warp and accelerates on a wild ride . Once it's over, the Robinsons are shocked to see planet Earth lingering before them . There is no contact with Alpha Control, but the Professor decides to land anyway and sets the ship down in a small Michigan town which they find strangely deserted . Turning on a radio, the Professor learns they have time warped to the year 1947 and the townsfolk think they have been invaded by aliens . Meanwhile, Dr. Smith believes he can make a fortune advancing the technology of the backward era and, disguised as a fire chief, he tries to lead a vigilante force to take the Robinsons prisoner . </P> Guest stars: Robert Foulk (Joe Cragmire), Pitt Herbert (Grover), Claire Wilcox (Stacy), Norman Leavitt (Charlie), Robert Pine (Craig), Bart La Rue (Car Radio Announcer / uncredited) </Td> </Tr> <Tr> <Th> 62 </Th> <Td> </Td> <Td> "Kidnapped in Space" </Td> <Td> Don Richardson </Td> <Td> Robert Hamner </Td> <Td> September 20, 1967 (1967 - 09 - 20) </Td> </Tr> <Tr> <Td_colspan="6"> <P> Dr. Smith intercepts a distress call from an alien ship that asks for medical assistance and promising a "great reward" to whoever helps . Smith and the Robot take the space pod and board the alien craft where they find a crew of androids who take Smith to their sick leader--a malfunctioning computerized brain . Smith realizes he is in over his head and tries to leave, but the androids threaten to kill him if he backs out . The Robot comes to the rescue stating he can fix the computer, but he refuses once he learns the brain is evil and wants to take over the universe . Meanwhile, the androids capture the Jupiter 2 and threaten to kill the Robinsons if the Robot doesn't conduct the repairs . </P> Guest stars: Grant Sullivan (Alien #764), Carol Williams (Alien #1220), Maritza Elsen (Alien Soldier #1 / uncredited), Jeffrey Trayler (Alien Soldier #2 / uncredited), Craig Chudy (Alien Soldier #3 / uncredited), Rita Fabotta (Alien Soldier #4 / uncredited), Joey Russo (Young Smith / uncredited) </Td> </Tr> <Tr> <Th> 63 </Th> <Td> </Td> <Td> "Hunter's Moon" </Td> <Td> Don Richardson </Td> <Td> Jack Turley </Td> <Td> September 27, 1967 (1967 - 09 - 27) </Td> </Tr> <Tr> <Td_colspan="6"> <P> Professor Robinson and the Robot head out in the space pod to investigate a nearby planet . After landing, the Professor kills a hostile creature and he is quickly approached by a furious alien named Megazor who claims he has cost him points in an intergalactic hunt by killing the beast . The alien hunter then decides the Professor will make a more valuable target and has him prepare himself to survive as the target for the next hunt . Back on the Jupiter 2, Dr. Smith refuses to risk a rescue of the Professor and tries to force the ship back to Earth . He instead fouls the controls and causes a crash landing . Once again, the Robinson family is stranded on an alien world . </P> Guest star: Vincent Beck (Megazor), Fred Krone (Invisibo / uncredited), Jim Mills (Voices / uncredited), Joe E. Tata (Robot Judge Voice / uncredited) </Td> </Tr> <Tr> <Th> 64 </Th> <Td> 5 </Td> <Td> "The Space Primevals" </Td> <Td> Nathan Juran </Td> <Td> Peter Packer </Td> <Td> October 4, 1967 (1967 - 10 - 04) </Td> </Tr> <Tr> <Td_colspan="6"> <P> While the Jupiter 2 is threatened by lava flows from an erupting volcano, Major West and a reluctant Dr. Smith are on a mission in the Chariot to cap the mountain with a nuclear explosive . Arriving at the site, the two are accosted by a tribe of cavemen who worship an ancient computer, Protinius, that gives the chief strange powers . Major West tries to warn them of the danger the volcano poses, but the chief has him and Smith sealed up inside a cave . As the oxygen runs out, Smith and West try to reconcile their differences as the end draws near . Meanwhile, the Professor, Will and the Robot mount a rescue, with the Robot challenging the computer as the mechanical leader of the tribe . </P> Guest star: Arthur Batanides (Rangah) </Td> </Tr> <Tr> <Th> 65 </Th> <Td> 6 </Td> <Td> "Space Destructors" </Td> <Td> Don Richardson </Td> <Td> Robert Hamner </Td> <Td> October 11, 1967 (1967 - 10 - 11) </Td> </Tr> <Tr> <Td_colspan="6"> <P> After Dr. Smith, Will and the Robot find a cave full of strange machinery, Smith fiddles with the controls and creates a faceless android that chases him back to the ship . The Professor destroys the android and has Smith confined to his quarters . Later Smith sneaks back to the cave to make more androids . This time, however, they are not only programmed to serve Smith, they look just like him . When Will learns of Smith's personal army, he tries to stop him, but Will becomes trapped in the android machine and emerges as a Smith - faced android programmed with the twisted desire to control the universe . Guest star: Tommy Farrell (Cyborg) </P> Note: This episode was nominated in 1968 for an Emmy award for Outstanding Individual Achievement in the Visual Arts, Dan Striepeke </Td> </Tr> <Tr> <Th> 66 </Th> <Td> 7 </Td> <Td> "The Haunted Lighthouse" </Td> <Td> Sobey Martin </Td> <Td> Jackson Gillis </Td> <Td> October 18, 1967 (1967 - 10 - 18) </Td> </Tr> <Tr> <Td_colspan="6"> <P> Moments before takeoff, Penny encounters an elf - like boy named J - 5 who claims to be the last survivor of a doomed colony, and the Robinsons take him with them when they leave . Soon the Jupiter 2 comes upon a remote Earth space station commanded by an eccentric old man, Colonel Silas Fogey, who offers the Robinsons enough fuel to get back to Earth . Unfortunately, he doesn't have enough for them to swing by J - 5's world as well . Upset that he won't be going home, J - 5 unleashes his imaginary friend Zaybo upon the station and tries to steal the Jupiter 2 . </P> Guest stars: Lou Wagner (J - 5), Woodrow Parfrey (Col. Silas Fogey), Kenya Coburn (Zaybo), Zamba (The Lion / uncredited) </Td> </Tr> <Tr> <Th> 67 </Th> <Td> 8 </Td> <Td> "Flight into the Future" </Td> <Td> Sobey Martin </Td> <Td> Peter Packer </Td> <Td> October 25, 1967 (1967 - 10 - 25) </Td> </Tr> <Tr> <Td_colspan="6"> <P> Dr. Smith, Will and the Robot are accidentally launched away in the space pod and land on a nearby planet . The family chases after them but crash lands nearby in a barren desert . Meanwhile, the pod crew find themselves in a tropical rainforest even though they are only a half - mile from the ship . Feeling sleepy, Smith and Will take a nap, but wake up over 270 years in the future where Will meets a distant relative that looks like Judy . Likewise, Smith meets a great - great - great - great - grandson who blames him for tarnishing the Smith family name . </P> Guest stars: Lew Gallo (Commander Fletcher), Don Eitner (Sergeant Smith), John Hunt (First Stone Monster / Spike Monster / uncredited), Bart La Rue (Illusion Machine voice / uncredited) </Td> </Tr> <Tr> <Th> 68 </Th> <Td> 9 </Td> <Td> "Collision of Planets" </Td> <Td> Don Richardson </Td> <Td> Peter Packer </Td> <Td> November 8, 1967 (1967 - 11 - 08) </Td> </Tr> <Tr> <Td_colspan="6"> <P> A group of spaced - out hippies arrive on the Robinson's planet and begin setting up planetary explosives . They claim the planet is on a collision course with their world and they have been tasked to destroy it, leaving the Robinson's little choice but to rush repairs and get the Jupiter 2 back into space . In the meantime, Dr. Smith is exposed to a strange gas and passes out . He later awakens with curly green hair and superhuman strength . </P> Guest stars: Daniel J. Travanti (Ilan), Linda Gaye Scott (Alien Girl), Joe E. Tata (Short Alien / uncredited), Steve Merjanian (Muscular Alien / uncredited) </Td> </Tr> <Tr> <Th> 69 </Th> <Td> 10 </Td> <Td> "The Space Creature" </Td> <Td> Sobey Martin </Td> <Td> William Welch </Td> <Td> November 15, 1967 (1967 - 11 - 15) </Td> </Tr> <Tr> <Td_colspan="6"> <P> The Jupiter 2 is caught in the orbit of a fog - shrouded planet where a gaseous entity creeps aboard . When it learns Will "just wants to be alone," people begin to disappear, starting with Maureen, Judy, Penny, Major West then Dr. Smith . Eventually the Professor and the Robot vanish and Will finds himself completely alone and terrified . Meanwhile, the others find themselves in a foggy realm and tormented by an evil entity who feeds off their fear . </P> Guest stars: Ron Gans (Creature voice / uncredited), Fred Krone (Id Monster / uncredited), Dawson Palmer (Creature / uncredited) </Td> </Tr> <Tr> <Th> 70 </Th> <Td> 11 </Td> <Td> "Deadliest of the Species" </Td> <Td> Sobey Martin </Td> <Td> Robert Hamner </Td> <Td> November 22, 1967 (1967 - 11 - 22) </Td> </Tr> <Tr> <Td_colspan="6"> <P> The Robinsons land on a planet and are followed down by a space capsule that crashes nearby . Soon, two androids arrive with orders to take the capsule, but they believe the Robinsons are hiding it and attack them . Meanwhile, the Robot locates the capsule and encounters a female robot . Although she is evil, the Robot begins to fall in love and is easily manipulated to serve her . When she demands a device the Robinsons cannot live without, the Robot's loyalties are tested . </P> Guest stars: Ron Gans (Alien Leader), Lyle Waggoner (Mechanical Man I), Ralph Lee (Mechanical Man II), Sue England (Female Robot voice / uncredited) </Td> </Tr> <Tr> <Th> 71 </Th> <Td> 12 </Td> <Td> "A Day at the Zoo" </Td> <Td> Irving J. Moore </Td> <Td> Jackson Gillis </Td> <Td> November 29, 1967 (1967 - 11 - 29) </Td> </Tr> <Tr> <Td_colspan="6"> <P> Penny encounters a caveboy named Oggo who tries to warn her of an evil zookeeper named Farnum, but she is captured in Farnum's trap and he adds her to his collection of human exhibits . Farnum then captures Major West and Judy, then Dr. Smith, Will and the Robot . When Will and Oggo try to escape, Will and Farnum are knocked through a portal and become trapped on a hostile planet . With Farnum out of the way, Dr. Smith tries to take over the show once he learns how lucrative a space zoo can be . Guest stars: Leonard Stone (Farnum), Gary Tigerman (Oggo), Ronald Weber (Mort) </P> Note: Guy Williams does not appear in this episode . </Td> </Tr> <Tr> <Th> 72 </Th> <Td> 13 </Td> <Td> "Two Weeks in Space" </Td> <Td> Don Richardson </Td> <Td> Robert Hamner </Td> <Td> December 13, 1967 (1967 - 12 - 13) </Td> </Tr> <Tr> <Td_colspan="6"> <P> A group of alien bank robbers, disguised as humans, brainwash the Celestial Department Store manager Mr. Zumdish into thinking he is a galactic tour guide . With the thieves looking for a place to lie low, Zumdish contacts Dr. Smith who learns the "vacationers" are willing to spend lots of money for some R & R. With the rest of the Robinsons off on a survey mission, Smith turns the empty Jupiter 2 into a 5 - star resort with Will as the bellboy and the Robot laboriously filling every other position a hotel needs . </P> Guest stars: Fritz Feld (Zumdish), Richard Krisher (MXR), Eric Matthews (QZW), Edy Williams (NON), Carroll Roebke (TAT) </Td> </Tr> <Tr> <Th> 73 </Th> <Td> 14 </Td> <Td> "Castles in Space" </Td> <Td> Sobey Martin </Td> <Td> Peter Packer </Td> <Td> December 20, 1967 (1967 - 12 - 20) </Td> </Tr> <Tr> <Td_colspan="6"> <P> Major West, Judy, Will, Dr. Smith and the Robot are on a mission to install a radar station when Smith stumbles upon a being frozen in a block of ice . While standing guard, Smith carelessly places a thermal blanket over the ice and it melts releasing an alien princess . Soon, a silver - skinned bounty hunter - desperado named Chavo arrives and holds Will captive under the guard of fake soldiers . Chavo then demands West surrender the ice woman or he will harm the boy . West challenges Chavo to a duel to save to her instead . </P> Guest stars: Alberto Monte (Chavo), Corinna Tsopei (Princess Reyka) </Td> </Tr> <Tr> <Th> 74 </Th> <Td> 15 </Td> <Td> "The Anti-Matter Man" </Td> <Td> Sutton Roley </Td> <Td> K.C. Alison </Td> <Td> December 27, 1967 (1967 - 12 - 27) </Td> </Tr> <Tr> <Td_colspan="6"> <P> While conducting a power experiment, Professor Robinson brings forth an evil double of himself from a parallel universe . The double takes him back to an anti-matter world where a sinister clone of Major West also exists . Trying to find the Professor, Will and Robot recreate the experiment and venture to the alternate dimension, but they bring back the anti-matter duplicate instead (thinking it's the real Professor). Everyone suspects something is wrong as the Professor acts cruel, demanding, paranoid and casts no shadow . Will then sneaks away to find his real dad, followed by the anti-Professor and later Smith and the robot . After escaping his cage, the real Professor meets up and fights his anti-self, winning and bringing the universe to it's normal state . </P> Guest star: Fred Krone (Alien Monster / uncredited) </Td> </Tr> <Tr> <Th> 75 </Th> <Td> 16 </Td> <Td> "Target Earth" </Td> <Td> Nathan Juran </Td> <Td> Peter Packer </Td> <Td> January 3, 1968 (1968 - 01 - 03) </Td> </Tr> <Tr> <Td_colspan="6"> <P> While in space, Dr. Smith separates the Robot's upper body from his track section which wheels itself into the space pod and takes off . The Robinsons chase the pod to a nearby planet where it lands amidst an alien city . There, the crew encounter a race of blob creatures that all look the same . Wanting to experience human individuality, the aliens take the form of the crew and hijack the Jupiter 2 on a course for Earth . Will and Smith, having sneaked aboard, try to sabotage the ship and warn Earth that their ship has been taken over by hostile aliens . </P> Guest stars: Jim Gosa (Gilt Proto), Brent Davis (Mike Officer / uncredited), Thant Brann (2nd Officer / uncredited), Ralph Madlener (Proto #2 / uncredited), Jeffrey Trayler (Proto #3 / uncredited) </Td> </Tr> <Tr> <Th> 76 </Th> <Td> 17 </Td> <Td> "Princess of Space" </Td> <Td> Don Richardson </Td> <Td> Jackson Gillis </Td> <Td> January 10, 1968 (1968 - 01 - 10) </Td> </Tr> <Tr> <Td_colspan="6"> <P> On a search to find a missing Princess, a space captain named Kraspo believes Penny is the girl he is looking for . Will tries to convince the captain that he's made a mistake, but Penny passes all his tests to verify her identity including feeling a pea hidden under a mattress . Once Dr. Smith learns he could live like royalty serving Penny in her kingdom, he tries to convince the bewildered girl to accept the situation . Meanwhile, Will overhears Kraspo's robotic crew plotting a mutiny to take over during Penny's coronation ceremony . </P> Guest stars: Robert Foulk (Kraspo), Arte Johnson (Fedor), Sheila Allen (Aunt Gamma) </Td> </Tr> <Tr> <Th> 77 </Th> <Td> 18 </Td> <Td> "Time Merchant" </Td> <Td> Ezra Stone </Td> <Td> Bob & Wanda Duncan </Td> <Td> January 17, 1968 (1968 - 01 - 17) </Td> </Tr> <Tr> <Td_colspan="6"> <P> While conducting an experiment to capture cosmic energy, Will inadvertently traps Chronos, an alien who controls time . Furious at Will for interfering in his business, Chronos forces the boy to return with him to his factory . When Professor Robinson learns what happened, he and the Robot pursue the alien, followed by Dr. Smith . When Smith learns Chronos' machine can transport him through space as well as time, he "steals" a ride back to Earth in 1997, hours before the launch of the Jupiter 2 . Chronos warns Robinson that unless Dr. Smith is on board the Jupiter 2 at lift off, the ship will eventually be destroyed by an uncharted asteroid and the Robinsons and Major West will all be killed . Guest star: John Crawford (Dr. Chronos), Byron Morrow (General Squires), Hoke Howell (Sgt. Rogers), Fred Krone (Chronos' Alien Assistant / uncredited), Brett Parker (Security Guard / uncredited) </P> Note: Regulars June Lockhart, Mark Goddard, Marta Kristen and Angela Cartwright only appear in flashback sequences in this episode . </Td> </Tr> <Tr> <Th> 78 </Th> <Td> 19 </Td> <Td> "The Promised Planet" </Td> <Td> Ezra Stone </Td> <Td> Peter Packer </Td> <Td> January 24, 1968 (1968 - 01 - 24) </Td> </Tr> <Tr> <Td_colspan="6"> <P> The Robinsons finally arrive at their destination, the Alpha Centauri system, but they are surprised to find an Earth colony already established there . Another oddity is that it only seems to be populated by teenagers who try to brainwash Penny and Will into rebelling against the "olders ." When Dr. Smith snoops around, he discovers the teens are really aliens in human guise, but they give Smith his youth back and make him forget what he saw . The aliens, who never grow older - minded than adolescents, try to discover what makes the human children mature . </P> Guest stars: Gil Rogers (Bartholomew), Keith Taylor (Edgar), Ezra Stone (Computer Voice) </Td> </Tr> <Tr> <Th> 79 </Th> <Td> 20 </Td> <Td> "Fugitives in Space" </Td> <Td> Ezra Stone </Td> <Td> Robert Hamner </Td> <Td> January 31, 1968 (1968 - 01 - 31) </Td> </Tr> <Tr> <Td_colspan="6"> <P> Major West and Dr. Smith encounter an alien fugitive who forcibly swaps his prison shirt for Smith's jacket and flees the scene just as prison guards arrive . West and Smith then find themselves accused of aiding the criminal and stand trial before a computerized judge . Will and the Robot act as their legal council, but the two are found guilty as charged and sent to the notorious prison planet Destructon to serve life sentences . There the two overhear another prisoner's escape plan and Smith is willing to go along with it . West, however, holds on to hope that Will and the Robot can somehow arrange a legal release . Guest stars: Michael Conrad (Creech), Tol Avery (Warden), Charles Horvath (Guard #1), John Hunt (Monster #1 / uncredited), Ralph Madlener (Monster #2 / uncredited) </P> Notes: Regulars Guy Williams, June Lockhart, Marta Kristen and Angela Cartwright do not appear in this episode . This episode had been in production at the same time as Planet of the Apes, and John Chambers' make - up was tested during this episode . Jonathan Harris was offered a part in the movie, but disliked the four - hour make - up process, and turned it down . </Td> </Tr> <Tr> <Th> 80 </Th> <Td> 21 </Td> <Td> "Space Beauty" </Td> <Td> Irving J. Moore </Td> <Td> Jackson Gillis </Td> <Td> February 14, 1968 (1968 - 02 - 14) </Td> </Tr> <Tr> <Td_colspan="6"> <P> The space traveling showman Farnum B. returns seeking contestants for a Miss Galaxy pageant and sets his sights on Judy when his mysterious sponsor demands she enter . Judy turns down the offer, but Dr. Smith, knowing he could profit greatly for signing her up, coerces her into signing a contract . When Major West reads the fine - print he learns the winner of the contest must be given over to the sinister being who is made of fire and comes from a dark world without beauty . Guest stars: Leonard Stone (Farnum), Dee Hartford (Nancy Pi Squared), Miriam Schillar (Miss Teutonium), Ronald Weber (Alien Dictator / uncredited), Jim Mills (Alien Knight #1 / uncredited), Bart La Rue (Alien Knight #2 / uncredited) </P> Note: Regulars Guy Williams and June Lockhart do not appear in this episode . </Td> </Tr> <Tr> <Th> 81 </Th> <Td> 22 </Td> <Td> "The Flaming Planet" </Td> <Td> Don Richardson </Td> <Td> Barney Slater </Td> <Td> February 21, 1968 (1968 - 02 - 21) </Td> </Tr> <Tr> <Td_colspan="6"> <P> The Jupiter 2 passes through a radiation storm and Dr. Smith's alien plant mutates, growing into an intelligent monster . He dumps it out the airlock, but it attaches to the hull and endangers the ship . The Professor takes the ship into a planet's atmosphere to burn it off the hull, but the inhabitant of the world attacks and drains the ship's energy . Stuck in orbit, Major West forces Smith to go with him down to the planet to talk to the attacker--an alien called the Sobram . The being offers to spare the Jupiter 2 only if the Robot stays behind and plays a wargame with him . Unbeknown to all, the plant creature has made it to the surface and begins to multiply into an army of its own--and becomes a far better challenge for the Sobram . </P> Guest stars: Abraham Sofaer (Sobram), Harry Monty (Small Plant / uncredited), Jerry Traylor (Plant Creature #1 / uncredited), John Hunt (Plant Creature #2 / uncredited), Paul Kessler (Plant Creature #3 / uncredited) </Td> </Tr> <Tr> <Th> 82 </Th> <Td> 23 </Td> <Td> "The Great Vegetable Rebellion" </Td> <Td> Don Richardson </Td> <Td> Peter Packer </Td> <Td> February 28, 1968 (1968 - 02 - 28) </Td> </Tr> <Tr> <Td_colspan="6"> <P> As the Robinsons celebrate the Robot's birthday, Dr. Smith sneaks off in the space pod to a planet dominated by plants . After pulling a flower, he is accused of murder by Tybo, a carrot - man, who punishes him to an eternity of literal tree - hugging . The family lands to search for Smith and meets a purple - haired botanist named Willoughby who explains that Tybo is the one in charge . After Smith is transformed into a talking stalk of celery, and Penny grows into a flower bed, the Professor and Major West try sabotaging Tybo's moisture - control system to stop the plant tyrant . Guest stars: Stanley Adams (Tybo), James Millhollin (Willoughby the Llama), Jerry Traylor (Plant) </P> Notes: In 1997 TV Guide ranked this episode number 76 on it's' 100 Greatest Episodes of All Time' list . Because of Guy Williams' and June Lockhart's inability to control their laughter during filming of this episode, they were put on suspension, explaining why they do not appear in the next episodes to be produced, "Fugitives in Space" and "Space Beauty ." </Td> </Tr> <Tr> <Th> 83 </Th> <Td> 24 </Td> <Td> "Junkyard in Space" </Td> <Td> Ezra Stone </Td> <Td> Barney Slater </Td> <Td> March 6, 1968 (1968 - 03 - 06) </Td> </Tr> <Tr> <Td_colspan="6"> <P> A fire breaks out aboard the Jupiter 2 and the Robinsons must land on a nearby planet to make repairs . They momentarily lose contact with the Robot, who has taken the space pod to scout ahead . Upon landing, the family discovers the entire planet is a massive junkyard run by a strange metallic junkman who has no intention of letting the Robinsons leave . When the ship's food supply becomes contaminated by a "rust blight," Dr. Smith bargains with the junkman for food, offering parts from the Robot to replace the junkman's own degrading circuits . The junkman eventually sets his sights on Jupiter 2, and after upgrading himself with the Robot's parts, he steals the ship with Dr. Smith aboard and leaves the Robinsons behind . Will follows in the space pod hoping the Robot's memory banks, now part of the junkman, can influence a change of heart . Guest star: Marcel Hillaire (Junkman) </P> Note: While this episode was in production, the cast and crew were informally made to believe the series had been renewed for a 4th season and indeed at least one script (4th season premiere "Malice in Space") was written . Some accounts claim as many as five scripts . However, less than two months later, in May 1968, CBS announced they had cancelled the series and no 4th season was produced . </Td> </Tr> </Table> <Tr> <Th> No. in series </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> </Tr>

How many episodes of lost in space are there