On an all-new episode of The Big Bang Theory entitled "The Separation Agitation," which airs Thursday, Apr. 13 at 8/7c on CBS and CBS All Access, Amy and Sheldon pay homage to the origin of Fun With Flags.
Meanwhile, lovable geologist Bert (Brian Posehn) introduces the gang to his beautiful new girlfriend, Rebecca, who may—or may not—have ulterior motives.
Check out the video above for photos from the upcoming episode, including a glimpse at Bert's new love interest.
Also, Bernadette struggles with her decision to go back to work and leave Halley in daycare.
PHOTOS: Amy And Sheldon Take Fun With Flags On-Location
Will ShAmy's Fun With Flags special go the distance? And what will the gang make of Bert's unexpected romance?
Watch all-new episodes of The Big Bang Theory on Thursdays at 8/7c on CBS and CBS All Access.