Buzz Aldrin to Appear on The Big Bang Theory

Another astronaut is heading to The Big Bang Theory.

Buzz Aldrin is set to make a cameo on the Halloween-themed episode that airs on Thursday, Oct. 25, CBS announced Tuesday. 

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Aldrin, the second man to walk on the moon, is the second astronaut to appear on the CBS comedy following Mike Massimino, who portrays himself as a member of Howard's (Simon Helberg) crew in space.

The Big Bang Theory airs Thursdays at 8/7c on CBS.