Tanya Roberts, the actress portraying Midge Pinciotti, had to leave the show to take care of a sick relative. The writers made her character leave Bob and move to California in episode The Relapse.
She came back to Point Place to see her daughter (Donna) in episode The Seeker and then appeared in a few episodes of Season 7.
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On that 70s show midge is played by tanya roberts... the character of midge is Bob's wife and Donna's mom.
Tina Pinciotti (Amanda Fuller) was seen only once in episode Eric's Burger Job (1-5). Her "mysterious" disappearance was mentioned in the last scene of episode Vanstock (2-6), in a soap-like ending:Announcer: And whatever happened to Midge's daughter Tina? [...] Confused? You won't be, after the next episode of That '70s Show
That '70s Show
Topher Grace.
Laura Prepon
Shannon Elizabeth