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Rob, Steelo and Rocsi Diaz punish their tongues in "Tongue Dumb," mess with friends on the fairway in "Greenholes" and witness unlikely tow jobs in "Un-tow-lievable."

Rob, Chanel and Steelo welcome Chris "Drama" Pfaff to look on the bright side in "Making Lemonade," get dazzled by some "Butt Magic" and check out some unusual bucket lists with "Die Happy."

Rob, Steelo and Lolo Wood welcome Mo Heart from "RuPaul's Drag Race" to flip with some at-home acrobats, take a fall with one bad step and celebrate the most magnificent mullets.

The gang runs into Penny's old boyfriend while out at a wine bar; Bernadette spends an evening with Sheldon; Koothrappali's introduction of his new girlfriend doesn't go as planned.

Sheldon wants to go to a movie screening, so he pays Stuart to spend the day with Amy; Penny has a difficult time connecting with Leonard's visiting mother.

Leonard's recently divorced parents and Sheldon's devoutly religious mother visit; when they are contacted about their guidance system, Wolowitz and Koothrappali think the government is after them.

The group struggles through an awkward morning after Sheldon's mother and Leonard's father spend an evening together; Penny's family arrives.

Wolowitz has a meeting with Colonel Williams, a representative from the Air Force Department of Material Command.