Season 6, Episode 23 - The Love Spell Potential
Aired May 9, 2013
After the girls' trip to Vegas goes awry, they join the guys for a game of Dungeons and Dragons, which takes Sheldon and Amy's relationship to an unexpected place. Meanwhile, Raj and Lucy have a very awkward date
Season 11, Episode 20 - The Reclusive Potential
Aired April 12, 2018
When a reclusive genius, Dr. Wolcott, invites Sheldon to his cabin in the middle of nowhere, Leonard, Howard and Raj go along for the trip. Meanwhile, Penny and Bernadette try to spice things up when Amy finds the bachelorette party they threw her too tame.