Original: Introduced in the film Star Wars Episode IV: A New Hope (1977), Solo and his Wookiee first mate, Chewbacca (Peter Mayhew), become involved in the Rebel Alliance against the Galactic Empire.
Simplified: He appears for the first time in Star Wars Episode IV: A New Hope as a smuggler with his Wookiee friend, Chewbacca. Both of them are with the side of the Rebels and fight against the evil Galactic Empire.