The second man to walk on the moon is stepping foot into CBS' The Big Bang Theory.
Buzz Aldrin has booked a cameo on the nerdy comedy, CBS has announced. Aldrin, who in 1969 was aboard the first manned lunar landing flight on Apollo 11, will cameo in the Oct. 25 episode, "The Holographic Excitation," when the gang celebrates Halloween.
Aldrin becomes the show's second astronaut to guest star, joining Mike Massimino, who plays himself and recurs as a member of Howard's (Simon Helberg) shuttle crew.
The retired astronaut joins a long roster of guest stars to board the Chuck Lorre comedy. Last season, the series welcomed Leonard Nimoy for a guest turn where he voiced a Spock action figure, as well as Stephen Hawking, who also played himself.
The Big Bang Theory airs Thursdays at 8 p.m. on CBS.