Andie Bergstrom (Kate Capshaw), an astronaut eagerly awaiting her first trip to space, runs a summer camp for teenagers with her NASA-employed husband, Zach (Tom Skerritt). One night during an engine test, Andie and four teenage campers are accidentally shot into space. Together, the group -- which includes Kathryn (Lea Thompson), a pilot-in-training, and Tish (Kelly Preston), a ditz with a perfect memory -- must work together to operate the spacecraft and return home.