A new success for Leonard makes Sheldon very jealous and throws Penny for a loop. Meanwhile, Koothrappali pushes Lucy too far in their relationship. (TV-PG L)
When the girls' trip to Vegas falls through, the guys invite them to play Dungeons & Dragons, causing Sheldon and Amy's relationship to take an unexpected turn. Meanwhile, Koothrappali and Lucy go on a very awkward date. (TV-PG D, L)
Sheldon and Leonard hire Professor Proton, the host of their favorite childhood TV show, to perform. Also, Howard and Bernadette run into trouble babysitting Raj's dog. Bob Newhart guest stars as Professor Proton. (TV-PG L)
Sheldon feels lost after one of his favorite TV shows gets canceled too soon and Amy tries to help him get over his compulsive need for closure. Meanwhile, Raj discovers a secret about his new love interest. (TV-PG D, L)
Amy feels threatened when Sheldon hires a young female assistant, and the pressure of being in space takes its toll on Wolowitz. (TV-PG D)
Kunal Nayyar, 'Rajesh Koothrappali' of THE BIG BANG THEORY, joins Chris Harrison in the Hollywood 411 studio. He talks about the show's success and his own SLUMDOG MILLIONAIRE-style background.
THE BIG BANG THEORY's Simon Helberg, 'Howard Wolowitz', joins Chris Harrison in the Hollywood 411 studio to talk about the guys' trip to the Artic Circle. He enlightens us to the phenomenon of Rock, Paper, Scissors, Lizard, Spock.