CBS will reunite two former Roseanne stars on the new comedy The Big Bang Theory. Johnny Galecki, who once played the husband of Roseanne’s daughter Darlene, stars in the new series as Leonard. Together with onscreen pal Sheldon (played by Jim Parsons), the two focus their attentions on a pretty neighbor played by Kaley Cuoco. Sara Gilbert will appear on the series, joining her former on-screen husband (Galecki) for an unspecified number of episodes. Gilbert will play Leonard’s co-worker and love interest on the series, though no one seems to know how long this will last, and it’s probably ratings that will decide. During her stint on ABC’s Roseanne, Gilbert earned two Emmy nominations.