David Letterman adds Philly Phanatic to superhero lineup of "The Avengers" (Video)

On a recent episode of "The Late Show" on CBS, David Letterman introduced a parody trailer of the upcoming movie "The Avengers" that included a surprise addition to the superhero lineup: the Philly Phanatic.

See if you can guess which one doesn't belong.

CBS/Video via MLB.com.
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