Obi Wan Kenobi has revealed the mission Luke Skywalker must go on to help Princess Leia and save The Resistance.

Darth Vader puts a bounty on the Millenium Falcon, which draws the attention of dangerous bounty hunters.

Luke is rescued by Ben Kenobi, who is later revealed to be Obi Wan.

Katara confronts her mother's killer head-on, intending to get revenge. She quickly realizes taking his life would not bring her mother back and decides to walk away.  

At the climax of their duel, Darth Vader reveals to Luke that he is indeed Luke's father. Luke cannot accept this.