How many actors from Roseanne will make guest appearences on The Big Bang Theory? We have already seen Sara Gilbert and Laurie Metcalf. I think it would be awesome to get Roseanne and John Goodman on there as Leonard's parents. And maybe Michael Fishman (D.J. from Roseanne) as another scientist? Lecy Goranson (Becky #1 on Roseanne) as Penny's older sister? I think it would be AMAZING to have the whole Roseanne cast on the same episode. It would probably cost a little bit of money but it would be worth it in terms of publicity and possibly high ratings. What do you guys think? Which characters do YOU think the Roseanne cast should play on Big Bang?