That ‘90s Show features a handful of returning characters including Red, Kitty, Eric, and Donna, but there are still That ‘70s Show characters that can return for That ‘90s Show season 2. The gang is all grown up and becoming “upstairs people,” according to Red. The parent storyline makes it easier to bring back familiar faces living in Point Place who may be parents in 1995.
https://screenrant.com/that-90s-show-missing-characters-return-season-2/