<P> Meanwhile, the probe alerts the Imperial fleet to the rebels' location . The Empire launches a large - scale attack, using AT - AT Walkers to capture the base, which forces the rebels to retreat . Han and Leia escape on the Millennium Falcon with C - 3PO and Chewbacca, but the ship's hyperdrive malfunctions . They hide in an asteroid field, where Han and Leia grow closer and eventually kiss . Vader summons bounty hunters to assist in finding the Falcon . Luke, meanwhile, escapes with R2 - D2 in his X-wing fighter and crash - lands on the swamp planet Dagobah . He meets a diminutive creature who reveals himself to be Yoda; after conferring with Obi - Wan's spirit, Yoda reluctantly accepts Luke as his student . </P> <P> After evading the Imperial fleet, Han's group travel to the floating Cloud City on the planet of Bespin, which is run by Han's old friend, Lando Calrissian . Unbeknownst to the group, the bounty hunter Boba Fett tracks the Falcon; shortly after their arrival, Lando leads the group into a trap and they are handed over to Darth Vader and Boba Fett . Vader plans to use the group as bait to lure out Luke, intending to capture him alive and take him to Emperor Palpatine . Luke sees a premonition of Han and Leia in pain and, against the wishes of Yoda and Obi - Wan, abandons his training to rescue them . </P> <P> Vader intends to hold Luke in suspended animation via carbon freezing, and selects Han to be frozen as a test subject . Han survives the process and is given to Fett, who intends to deliver Han to Jabba the Hutt . Lando initiates an escape and frees Leia and the others, but they are too late to stop Fett from departing with Han . They fight their way back to the Falcon and flee Cloud City . Meanwhile, Luke arrives at Cloud City and engages with Vader in a lightsaber duel that leads them over the city's central air shaft . Vader severs Luke's right hand, disarming him; when Luke refuses to join Vader against the Emperor, accusing him of murdering his father, Vader reveals that he, in fact, is his father . Horrified by the truth, Luke intentionally falls into the air shaft and is ejected beneath the floating city, where he grabs onto an antenna . He makes a telepathic plea to Leia, who senses it and persuades Lando to return for him in the Falcon . After Luke is brought on board, they are chased by TIE fighters but R2 - D2 reactivates the Falcon's hyperdrive, allowing them to escape . </P> <P> Aboard a medical frigate in the Rebel fleet, Luke's severed hand is replaced with a robotic hand . Lando and Chewbacca set off for Tatooine in the Falcon in order to find Jabba the Hutt and save Han . As the Falcon departs, Luke, Leia, R2 - D2, and C - 3PO gaze out on the galaxy and await word from Lando . </P>

When does luke find out darth vader is his father
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