The Zarnecki Incursion - S4-E19
Plot hole: While it would certainly destroy the entire plot of the episode, Sheldon could have simply contacted Blizzard's customer support to get all his stuff back.
Tanngrisnir
13th Apr 2013
The Big Bang Theory (2007)
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Suggested correction: A character not doing something that they theoretically could have isn't a plot hole. It's simply something that didn't occur to them. Regardless, the plot isn't broken because he doesn't do it; in fact, the opposite: it's required that he doesn't for the plot to work. If anything, it's a plot hook.