Topher Grace and Laura Prepon reprise their "That '70s Show" roles as Eric ... In addition to the first episode, Prepon also shows up in episode five and then the season one finale to take Leia ...
The first episode of That '70s Show season 1 is set in May 1976 ... and this doesn't change until season 6. However, the seasons (summer, fall, winter, spring) cycle through normally.