Since the finale of That '70s Show sees the group celebrate the arrival of 1980, 1978 makes a bit more sense. While the gang's graduation in That '70s Show season 5 mixed things up a bit ...

That is, until the show's final season after Topher Grace and Ashton Kutcher left the series. That 70's Show took Donna and completely ruined her characters arc and the heart of the series.

Topher Grace and Laura Prepon reprise their "That '70s Show" roles as Eric Forman ... Prepon also shows up in episode five and then the season one finale to take Leia back home when the summer ...