Weird Science - Season 4 - Eps 25: Swallow 13
Chett swallows a very rare invitation (complete with directions) to an underground rave. So, Lisa miniaturizes herself, Gary, Wyatt, and a space ship. They take a ride inside of Chett in hopes of getting the directions back. Just as in ""Fantastic Voyage,"" Lisa, Wyatt, and Gary get to see way too much of Chett... The complete inside of him. However, during the trip, Chett's girlfriend Sharon breaks up with him, and Wyatt gets Post Miniaturization Stress-Syndrome, causing him to go mad. Wyatt tries to ruin the plans of the mission, and the ship ends up running out of oxygen. Lisa and Gary need stone cold Chett to cry, or else be trapped inside his body with no air.
About Weird Science

Title: Weird Science
First Air Date: 1994-03-05
Last Air Date: 1998-07-25
Status: Ended
Rating: 6.682/10 (from 74 votes)
Language: EN
Seasons: 5
Total Episodes: 88
Network: USA Network
Genres: Sci-Fi & Fantasy, Comedy
Production Companies: Universal Television, St. Clare Entertainment, USA Network, Universal Television Entertainment
Synopsis
Gary Wallace, a teenager who dreams of beautiful women and a cheerful life, and his only friend, the shy and geek Wyatt Donnelly, always serve as a target for ridicule and bullying of violent classmates. Once using a computer and mysterious electrical radiation, they manage to bring to life the "woman of their dreams." Her name is Lisa, and she is ready to fulfill the wishes of her creators ...
Cast

Michael Manasseri
Wyatt Donnelly

John Asher
Gary Wallace

Vanessa Angel
Lisa

Lee Tergesen
Chett Donnelly