when does luke find out about his father
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 and Vader on his star destroyer, but R2-D2 reactivates the Falcon's hyperdrive, allowing them to escape.