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'The Skywalker Incursion' - Season 8, Episode 19
Sheldon and Leonard take a detour on the way to give a speech at UC Berkeley, hoping to meet an idol of theirs. Meanwhile, a disagreement between Howard and Bernadette over the future of his Doctor Who TARDIS leads to a ping pong battle with Penny, Raj and Amy.
Air Date: April 2, 2015.