Brent Spiner Brent Spiner

Cheers to The Big Bang Theory for finding an out-of-this-world new archenemy for Sheldon.

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Just when Jim Parsons' geek god had finally forgiven Wil Wheaton for failing to show up at a Star Trek convention years ago—the actor apologized and gave Sheldon his last Wesley Crusher action figure—Next Generation castmate Brent Spiner crossed the champion grudge-holder. His offense: tearing the aforementioned toy out of its original packaging.

Spiner—who's previously displayed his comedy chops in everything from Friends to the Jack Lemmon-Walter Matthau movie Out to Sea—slyly spoofed himself, agreeing to show up at Leonard's birthday party for a very small fee. Oh, and what he said they used to do with their mini-me dolls on the Next Generation set brings new meaning to action figure.

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