Season 4, Episode 4 - The Hot Troll Deviation
Aired October 14, 2010
Howard is embarrassed when the creepy reason behind his break-up with Bernadette is revealed. Meanwhile, a spat between Sheldon and Raj gets ugly as they engage in office warfare.
Season 8, Episode 14 - The Troll Manifestation
Aired February 5, 2015
After Sheldon and Leonard co-publish a physics paper online, they are dogged by the taunts of an anonymous commenter. When they work up the courage to confront their critic, the guys are surprised by the identity of their antagonist.
Meanwhile, Penny, Amy and Bernadette spend girls' night exploring embarrassing moments from each other's pasts, including low-budget movies, '90s beauty pageants, and Little House on the Prairie fan fiction.