A few years after the ending of A New Hope, The Rebel Alliance has suffered severe setbacks in the war against the Galactic Empire. Princess Leia is the leader of the base of the ice planet in the Hoth system and her two greatest fighters are Han Solo and Luke Skywalker.
A probe droid sent by Darth Vader lands on Hoth which Luke goes to investigate and is taken down a wampa. Han then goes searching for Luke after he has been gone for a long time. Luke manages to escape the wampa and sees a vision of Obi-Wan Kenobi telling him to go to the Planet Dagobah to train with Master Yoda. Han then finds him and they wait till their rescuers arrive.
Luke recovers in time to see the Imperial fleet attack with the AT-AT Walkers. The rebels put up a strong defense but couldn’t defend against the great might of the empire.
Han and Leia escape on the Millenium Flacon with Chewbacca and C-3PO and barely escape.
Luke crash lands on Dagobah and meets the mysterious Yoda who pretends to be a average swamp inhabitant in order to test his patience. After talking with Obi-Wan, Yoda accepts him as his pupil.
Han and Leia soon discover the ship is in a giant asteroid worm and after escaping they go to the side of a Star Destroyer in Vader’s fleet to escape them yet again.
Darth Vader the loses his patience with the fleet and sends out several bounty hunters to catch them.
At the same time, Luke begins his training and his power grows exponentially. He suffers a setback though in his training when he fails one of his tests and sees hi head in Darth Vader’s helmet.
He then becomes greatly troubled by visions of Han and Leia in trouble, and despite protestations from his teachers he leaves to save his friends.
Han takes the ship to Cloud City but unknowingly has the bounty hunter Boba Fett follow them and then he goes ahead of them and sets up Han and Leia’s capture. Vader then uses them as bait to bring Luke in.
Vader reveals his plan to put Luke in suspended animation and uses Han as a test subject. Before being frozen Han and Leia profess their love for each other. Boba Fett then takes Han’s frozen body to Jabba for his reward.
Lando then frees Leia and the rest of them but are to late to save Han and are forced to retreat without him.
Luke arrives on Cloud City like Vader planned and they duel. After loses his arm, Luke discovers that Darth Vader is his father and instead of joining him jumps into the Tube system and is ejected from Cloud City. He manages to grab hold of antenna and Leia and the Falcon come and save him.
With the Hyperdrive finally repaired, The Falcon escapes and Luke is given a artificial hand. Movie ends with Luke hearing a message from his father and he looks out with the rest of them staring out into space.