You gotta love this guest-starring appearance on The Big Bang Theory: that's former sitcom star Mayim Bialik!
Rating: 5.0 / 5.0
Judy Greer guest starred on The Big Bang Theory as Dr. Plimpton, a famous physicist that Sheldon invites to spend the weekend at the place.
Rating: 5.0 / 5.0
When Penny spends the night at Leonard's she ends up ruining oatmeal day by cooking french toast. How dare she?
Rating: 5.0 / 5.0
Sheldon tries to attack Leonard with his mind when he goes to give a presentation that Sheldon does not approve of.
Rating: 5.0 / 5.0
Penny and Leonard's mom, Beverly (Christine Baranski) go for some shots of tequila at the Cheesecake Factory.
Rating: 5.0 / 5.0
That's Katee Sackhoff and that's George Takei. Both guest star as themselves on the episode "The Hot Troll Deviation."
Rating: 5.0 / 5.0
Sheldon and Amy are all about spreading gossip in this photo. It's from the episode "The Herb Garden Germination."
Rating: 5.0 / 5.0
Sheldon busts a move on TBBT. Instant fun ensues.
Rating: 5.0 / 5.0
Howard Wolowitz comes to visit his new girlfriend, Bernadette (Melissa Rauch) at the Cheesecake Factory. He's desperate to keep her.
Rating: 5.0 / 5.0
Eliza Dushku guest stars on the November 4 episode of The Big Bang Theory. She plays a federal agent.
Rating: 5.0 / 5.0
This is awkward for everyone. Raj and Penny stand in front of the boys on the fifth season premiere.
Rating: 5.0 / 5.0
Sheldon is horrified when he finds a paint stain on his couch on next week's episode. Penny is going to get into some serious trouble for this!
Rating: 5.0 / 5.0

TBBT Quotes

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

Penny, there's only one cookie with something in the middle that solves life's problems, and that's an Oreo. Or a Nutter Butter, if you're in a pinch.

Sheldon