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Rob, Steelo, and Rachel Wolfson order clips from drivers "Happy to Deliver" and critique some influencers who are "Influencing No One."

YouTube prankster Vitaly Zdorovetskiy joins Rob, Chanel and Steelo to meet some "Natural Born Pranksters," travel to the "Broviet Union" and learn a few "Swole Shortcuts."

Bernadette runs into her ex-boyfriend (Rick Fox) while attending a science event with Wolowitz.

Sheldon takes acting lessons from Penny in hope of becoming a better teacher; Koothrappali fantasizes about his friend's girlfriend.

A wealthy donor makes Leonard question what he is willing to do for science.

Wolowitz considers taking things with Bernadette to the next level; Leonard and Raj's sister rekindle their relationship.

Sheldon is upset when he realizes Leonard is the center of their group of friends.

Leonard has to choose between Penny and his new girlfriend, Priya; Howard's magic trick drives Sheldon crazy.