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Penny's ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help; Koothrappali attempts to mend things with his ex-fiancee Anu.
Penny's ex-boyfriend Zack learns that he is infertile, so he asks Leonard for help; Koothrappali attempts to mend things with his ex-fiancee Anu.
More episodes
The Big Bang Theory
S5, EP7 "The Good Guy Fluctuation"An attractive comic book artist tests Leonard and Priya's relationship; Sheldon tries to scare his friends.
The Big Bang Theory
S5, EP8 "The Isolation Permutation"Amy is devastated when Penny and Bernadette shop for wedding dresses without her.
The Big Bang Theory
S5, EP9 "The Ornithophobia Diffusion"Leonard and Penny spend time alone; Sheldon tries to face his fear of birds.
The Big Bang Theory
S5, EP10 "The Flaming Spittoon Acquisition"Sheldon is jealous when Stuart (Kevin Sussman), a guy from the comic book store, asks Amy out on a date.
The Big Bang Theory
S12, EP16 "The D & D Vortex"The gang uses deception and betrayal to make it to the one open seat at Wil Wheaton's celebrity Dungeons and Dragons game with William Shatner, Joe Manganiello, Kareem Abdul-Jabbar and Kevin Smith.
The Big Bang Theory
S12, EP15 "The Donation Oscillation"Penny tries to throw a wrench into Leonard's plan to be a sperm donor for her ex-boyfriend; Wolowitz, Bernadette, Anu and Koothrappali turn Koothrappali's canceled bachelor party into a couple's trip aboard the "vomit comet."
The Big Bang Theory
S12, EP14 "The Meteorite Manifestation"Sheldon is thrilled to help Bernadette and Wolowitz navigate bureaucratic paperwork, until he discovers they are breaking the law; Leonard is disappointed when his friends exclude him from a scientific project.
The Big Bang Theory
S12, EP13 "The Confirmation Polarization"Sheldon and Amy are thrilled when their super asymmetry theory is proven by two physicists, until they try to kick Amy off the Nobel nomination; Bernadette has a big success at work.
