One day there's a big shakeup in this little world. The toy owner, named Andy, has a birthday. Woody dispatches all of the troops in a Bucket of Soldiers to spy on developments downstairs, and they use a Playskool walkie-talkie to broadcast developments. The most alarming: The arrival on the scene of Buzz Lightyear (Tim Allen), a space ranger.
Buzz is the most endearing toy in the movie, because he's not in on the joke. He thinks he's a real space ranger, temporarily marooned during a crucial mission, and he goes desperately to work trying to repair his space ship -- the cardboard box he came in. There's real poignancy later in the film when he sees a TV commercial for himself, and realizes he's only a toy.