While That '90s Show may be about a new youthful gang, the OG stars—including Topher Grace, Ashton Kutcher, Mila Kunis, Wilmer Valderrama and Laura Prepon—all reprise their respective roles from That '70s Show.
Don Stark, who played Donna's dad Bob Pinciotti, and Tommy Chong, who played Leo, the hippie owner of Foto Hut, also have cameos on That '90s Show.