 In a world where toys are living things who pretend to be lifeless when their owners are present , a group of toys owned by a six @-@ year @-@ old boy , Andy Davis ( John Morris ) , are caught off @-@ guard when Andy 's birthday party is moved up a week , as Andy , his single mother ( Laurie Metcalf ) and infant sister Molly are preparing to move the following week . The toys ' leader and Andy 's favorite toy , an old fashioned cowboy doll named Sheriff Woody ( Tom Hanks ) organizes the other toys , including Bo Peep the shepherdess ( Annie Potts ) , Mr. Potato Head ( Don Rickles ) , Rex the Dinosaur ( Wallace Shawn ) , Hamm the Piggy Bank ( John Ratzenberger ) and Slinky Dog ( Jim Varney ) , into a scouting mission . Green army men , led by Sarge ( R. Lee Ermey ) , spy on the party and report the results to the others via baby monitors . The toys are relieved when the party appears to end with none of them having been replaced , but then Andy receives a surprise gift – an electronic toy space ranger action figure named Buzz Lightyear ( Tim Allen ) , who believes that he is an actual space ranger . 
