All the "That '70s Show" OGs Who Pop Up in "That '90s Show"

Prepon returns as Donna in the series premiere when she and her now-husband, Eric, drop Leia off at her grandparents' house for the summer. She pops up again in episode five when she and Leia have a heart-to-heart and again in the season finale when she returns to Wisconsin to pick up her daughter at the end of the summer.