Weird Science - Season 4 - Eps 11: By the Time We Got to Woodstock
After Gary and Wyatt wish that they could time travel, the wish goes bad and they end up stuck in 1969 along with Lisa. After six months of being in the past, they realize that Lisa can't remember anything. She thinks that she's a hippie on her way to Woodstock. Wyatt and Gary need to get across the country and fix Lisa's memory or be stuck in the hippie age. Wyatt, Gary, and Chett all go on a road trip across the country, even meeting the future president.
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