Sheldon's old nemesis, Wil Wheton, returns as a guest star in the October 13 episode of The Big Bang Theory. Sheldon and Leonard get invited to a party at Wil Wheton's house and Sheldon tells Leonard he has to make a choice: the Wil Wheton party or their friendship. Meanwhile, we learn that Sheldon doesn't understand the concept of bargaining when he and Leonard try to buy a replica sword at a comic book store.
Howard also gets an "out-of-this-world" opportunity, but Bernadette isn't very happy about it. Other guest stars for the episode include Brent Spiner as himself.
To view photos for the October 13 episode of The Big Bang Theory, click the arrows above. Below is a trailer for the episode. The second video contains three sneak peeks.