Season 4, Episode 19 - The Zarnecki Incursion
Aired March 31, 2011
When Sheldon's World of Warcraft account is hacked and his digital items are taken, the guys try to find the culprit. After identifying the hacker, the guys set off on a quest to avenge Todd Zarnecki and bring Sheldon's battle ostrich home.
Season 8, Episode 19 - The Skywalker Incursion
Aired April 2, 2015
When Sheldon and Leonard are invited to give a lecture at UC Berkeley, they take a detour on the way there in the hopes of meeting an idol of theirs. Meanwhile, when Howard and Bernadette can't agree on the future of Howard's Doctor Who TARDIS, a ping pong battle with Penny, Raj and Amy settles the debate.