A group of sentient toys, who pretend to be lifeless when humans are around, are preparing to move into a new house with their young owner Andy Davis, his infant sister Molly, and their single mother Mrs. Davis. Learning that Andy's sixth birthday party has been unexpectedly moved to an earlier date, several toys — including Mr. Potato Head, Slinky Dog, Rex the tyrannosaur, Hamm the piggy bank, and Bo Peep the porcelain doll — become concerned that Andy might receive something that will replace them. To calm them, Sheriff Woody, Andy's favorite toy and their de facto leader, sends Sarge and his green army men to spy on Andy's birthday party with a baby monitor. Andy receives a Buzz Lightyear action figure, who believes he is an actual Space Ranger and does not know he is really a toy. Buzz impresses the others with his electronic features and becomes Andy's new favorite toy, provoking Woody's jealousy.
