SEASON FINALE: In last week’s episode, Penny (Kaley Cuoco) and Leonard (Johnny Galecki) proposed to one another – at first casually, then more somberly and touchingly (pictured). Tonight, we witness the short-term fallout from that decision, especially where Leonard’s roommate, Sheldon (Jim Parsons), is involved. And as an added bonus, we’re promised an appearance by Christine Baranski, in her recurring, hilarious role as Leonard’s mother.