He and Chewbacca were hired by Obi-Wan Kenobi and Luke Skywalker on Tatooine to transport them to the planet Alderaan, but those plans soon went awry. Initially only aiding the Rebellion to pay off his debt to the crime lord Jabba, Han shelved much of his cynicism, proved his heroism and became a Rebel leader.
Major spoilers from Episode VII of Star Wars below.
After the defeat of the Galactic Empire following Episode VI, Return of The Jedi, he became the husband of Leia and the father of Ben Solo a.k.a. Kylo Ren. In Episode VII, he confronts his son to try and turn him away from the Dark Side, but is killed by him.
