<Li> Dr. Zachary Smith (Jonathan Harris): Acting as Alpha Control's flight surgeon in the first episode, he is later referred to as a Doctor of Intergalactic Environmental Psychology, expert in cybernetics, and an enemy agent (roles that are rarely mentioned after the initial episodes). His attempt to sabotage the mission strands him aboard the Jupiter 2 and results in its becoming lost . </Li> <Li> The Robot: The Robot is a Class M - 3, Model B9, General Utility Non-Theorizing Environmental Robot, which had no given name . Although a machine, endowed with superhuman strength and futuristic weaponry, it often displayed human characteristics, such as laughter, sadness, and mockery, as well as singing and playing a guitar . The Robot was performed by Bob May in a prop costume built by Bob Stewart . The voice was dubbed by Dick Tufeld, who was also the series' narrator . The Robot was designed by Robert Kinoshita, who was also the designer of the iconic Robby the Robot for the 1956 sci - fi movie Forbidden Planet who made extensive appearances in subsequent films and productions . </Li> <P> During its three - season run, many actors made guest appearances, including familiar actors and / or actors who went on to become well - known . Among those appearing in Lost in Space episodes: Joe E. Tata, Kevin Hagen, Alan Hewitt, Warren Oates, Don Matheson, Kurt Russell, Ford Rainey, Wally Cox, Grant Sullivan, Norman Leavitt, Tommy Farrell, Mercedes McCambridge, Lyle Waggoner, Albert Salmi, Royal Dano, Strother Martin, Michael J. Pollard, Byron Morrow, Arte Johnson, Fritz Feld, John Carradine, Al Lewis, Hans Conried, Dennis Patrick, Michael Rennie among many others . Future Hill Street Blues stars, Daniel J. Travanti (billed as "Danny Travanty") and Michael Conrad, made guest appearances on separate episodes . While Mark Goddard was playing Major West, he had a guest appearance as well . Jonathan Harris, although a permanent cast member, was listed in the opening credits as "Special Guest Star" of every episode of Lost in Space . </P> <P> In 1962, the first appearance of a space - faring Robinson family occurred in a comic book published by Gold Key Comics . The Space Family Robinson, who were scientists aboard Earth's "Space Station One", are swept away in a cosmic storm in the comic's second issue . These Robinsons were scientist father Craig, scientist mother June, early teens Tim (son) and Tam (daughter), along with pets Clancy (dog) and Yakker (parrot). Space Station One also boasted two spacemobiles for ship - to - planet travel . </P>

Who was the cast in lost in space