12 Scenes from The Big Bang Theory's "The Colonization Application"

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A happy couple

Trouble arises when Amy learns Sheldon has applied for a one-way mission to colonize Mars and Leonard surprises Penny with a very "adult" purchase, on THE BIG BANG THEORY, Thursday, March 5 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Johnny Galecki, Kaley Cuoco-Sweeting, Jim Parsons and Mayim Bialik Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2015 WBEI. All rights reserved.