Carradine signs on for 'Big Bang Theory'

Keith Carradine has signed on for a role in the hit CBS comedy The Big Bang Theory dvd. Entertainment Weekly claims that Carradine will play lead character Penny's father in one episode. Half-brother to the late David Carradine, Keith will portray Frank Lundy on the series, although details surrounding the episode's plot are unknown right now. Last year, Emmy award-winning actress Christine Baranski appeared in an episode of the series as Leonard's mother. Carradine's episode of The Big Bang Theory will air this November.