Leonard and Penny may have finally gotten engaged on The Big Bang Theory, but bigger developments are in store for Thursday's Season 7 finale (8/7c, CBS). "There are a lot of moves made by different people in the finale," executive producer Steve Molaro tells TVGuide.com. After having an epiphany about string theory and losing his childhood hero Professor Proton (Bob Newhart) two weeks ago, he'll face some professional and personal shakeups in the finale. Even Molaro is slightly surprised at how quickly the duo's relationship has progressed since Raj finally learned to talk to women sober at the end of Season 6. [...] Molaro says producers will continue to refrain from plotting long arcs. [...] he says they currently have no idea how Season 8 will open, or where Sheldon will be. View original The Big Bang Theory Finale Preview: