Best Big Bang Theory Characters That Rarely AppearAmy, Bernadette, Penny, Stuart, Raj, Sheldon, Howard, Mrs. Wolowitz and Leonard are excluded from this list.
It's a shame they killed him off. - CatCode
I love him! He's one strong Leonard-Penny shipper! And I'm a huge fan of Leonard and penny's relationship too! He needs to appear more often!
He was at the space station with Howard. - CatCode
Um, I think he's dead. That's why. - RobertWisdom
I forgot about him PUT HIM AT NUMBER 2 - CatCode
A one-time appearance. Why? - PositronWildhawk