The opening crawl reveals that the Galactic Empire has pursued the Rebel Alliance across the galaxy, forcing them to establish a secret base on the remote ice planet Hoth. Dark Lord of the Sith Darth Vader (David Prowse/voice: James Earl Jones) sends robotic probes in search of the base and its commander, Luke Skywalker (Mark Hamill). While Luke is patrolling near the base, he's knocked unconscious by an indigenous predator, the Wampa. Back at the base, the smuggler-pilot Han Solo (Harrison Ford) announces his intention to leave the Rebels and pay the debt he owes to the gangster Jabba the Hutt, much to the displeasure of Princess Leia (Carrie Fisher). After Han discovers that Luke has not returned from patrol, he delays his departure and leaves the base to search for him. Luke escapes the Wampa's lair but is overcome by the cold. He sees an apparition of his late mentor, Jedi Master Obi-Wan Kenobi (Alec Guiness), who instructs him to receive training from Jedi Master Yoda (voice: Frank Oz) on the planet Dagobah. Han finds Luke and gives him shelter until they're rescued the following morning.