Based on the story by George Lucas and the screenplay by Lawrence Kasdan

A year after Han Solo's capture, [b] C-3PO and R2-D2 are sent to crime lord Jabba the Hutt's palace on Tatooine in a trade bargain made by Luke Skywalker to rescue Han, who is still frozen in carbonite. Disguised as the bounty hunter Boushh, Princess Leia infiltrates the palace under the pretense of collecting the bounty on Chewbacca and unfreezes Han, but is caught and enslaved. Luke soon arrives to bargain for his friends' release, but Jabba drops him through a trapdoor to be eaten by a rancor. After Luke kills it, Jabba sentences him, Han, and Chewbacca to death by being fed to the sarlacc, a deadly beast entombed in the desert floor that digests its prey over the course of a millennium. Having hidden his new lightsaber inside R2-D2, Luke frees himself and his friends, and they battle Jabba's men aboard the crime lord's sail barge. During the chaos, Boba Fett falls into the sarlacc after Han inadvertently damages his jet pack, and Leia strangles Jabba to death with her chains. The group destroy Jabba's sail barge and escape. As the others rendezvous with the Rebel Alliance, Luke returns to Dagobah to complete his Jedi training with Yoda, whom he discovers is dying. Yoda confirms that Darth Vader, once the Jedi knight Anakin Skywalker, is Luke's father, and reveals that there is another Skywalker, before vanishing and becoming one with the Force. Obi-Wan Kenobi's Force spirit then tells Luke that Leia is his twin sister, and that he must face Vader again to finish his training and defeat the Empire. The Alliance learns that the Empire has been constructing a second Death Star under the supervision of the Emperor. As the station is protected by an energy shield, Han leads a strike team which includes Luke, Leia and Chewbacca to destroy the shield generator on the forest moon of Endor; doing so will allow the Rebel Fleet to destroy the Death Star. The team uses a stolen Imperial shuttle to arrive undetected and encounters a tribe of Ewoks, gaining their trust after an initial conflict. Later, Luke tells Leia that she is his sister, Vader is their father, and that he must confront him. Surrendering to Imperial troops, he is brought before Vader, and fails to convince him to reject the dark side of the Force. Vader takes Luke to meet the Emperor, who intends to turn him to the dark side, and reveals that his friends and the Rebel Fleet are headed into a trap. On Endor, Han's team is captured by Imperial forces, but a counterattack by the Ewoks allows the Rebels to infiltrate the shield generator. Meanwhile, Lando Calrissian in the Millennium Falcon and Admiral Ackbar lead the Rebel assault on the second Death Star, finding its shield still active, and the Imperial fleet waiting for them. The Emperor reveals to Luke that the Death Star is fully operational and orders the firing of its superlaser, destroying a Rebel starship. He tempts Luke to give in to his anger. Luke attempts to attack him, but Vader intervenes and the two engage in a lightsaber duel. Vader senses that Luke has a sister and threatens to turn her to the dark side if he does not. Enraged, Luke defeats Vader, severing his prosthetic hand. The Emperor betrays Vader by ordering Luke to take his place, but Luke refuses, declaring himself to be a Jedi. Furious, the Emperor tortures Luke with Force lightning.