WARNING! This article contains SPOILERS for That '90s Show season 1!That '90s Show has finally addressed That '70s Show's mystery regarding Donna's missing sisters. As a sequel series to the original sitcom, That '90s Show has been able to answer some burning questions and unsolved mysteries left from That '70s Show's ending. While the franchise still keeps Fez's real name and home country a secret, questions regarding Eric and Donna's relationship status, Fez and Jackie's initial endgame romance, and the Formans' new neighbors after the Pinciottis have finally been answered.
But, instead of solving the franchise's longest-running mystery about Donna's family, That '90s Show erases its existence.
The Pinciotti family held a significant role throughout That '70s Show, though two members were suddenly retconned early in the series. In That '70s Show season 1, episode 5, Donna's 14-year-old sister Tina Pinciotti was introduced at a party, but was never seen again and only mentioned in season 2's soap opera parody voice-over asking, "What ever happened to Midge's daughter, Tina?" In the season 1 episode "Eric's Birthday," Midge referenced that Donna also had an older sister named Valerie at college, yet she would never be mentioned again or appear in the sitcom.
Donna was subsequently written as Midge and Bob's only child, which That '90s Show maintains.
Rather than attempting to answer what happened to Tina and Valerie, That '90s Show erases them from existence upon Bob's return to Point Place.
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