The Big Bang Theory

PG When Penny and Bernadette go to San Diego for a pharmaceutical sales convention, Wolowitz is left in charge of the kids.

PG The gang finds out that Wil Wheaton is hosting a celebrity Dungeons and Dragons game involving William Shatner, Joe Manganiello, NBA Legend Kareem Abdul-Jabbar and Director Kevin Smith.

PG Penny tries to seduce an abstaining Leonard to ruin his "donation" for her ex-boyfriend, Zack, and his wife, Marissa.

PG Sheldon is thrilled to help Howard and Bernadette navigate bureaucratic paperwork... until he discovers they are breaking the law.

PG When Sheldon and Amy's Super Asymmetry Theory is proven by two physicists from Chicago, they're thrilled - until they try to kick Amy off their Nobel Prize nomination!

PG Penny's old boyfriend, Zack, and his wife want a baby, but when Zack is infertile, they ask Leonard to help. Meanwhile, Raj attempts to mend things with his ex-fiancee Anu.

PG Penny and Leonard organise a paintball game that ends in mayhem when Sheldon gets jealous of Amy. Meanwhile, Raj catches Anu with her ex-boyfriend.

PG Sheldon and Amy are still down about their theory being disproved, but a VHS tape from Sheldon's past inspires him not to give up.

PG Sheldon and Amy are devastated to learn from a Russian paper that Super-Asymmetry has already been discovered and disproven.

PG Sheldon tries to bond with Amy's father. But when Howard lures Mr. Fowler away with magic tricks, Sheldon has no choice but to bond with Mrs. Fowler. Meanwhile, Raj and Anu attempt to get physical.