Michael Rapaport to guest star on The Big Bang Theory Posted October 12, 2015

Michael Rapaport (Prison Break, Friends) will guest star on an episode of The Big Bang Theory airing later this month, Yahoo! TV has exclusively reported.

The actor will appear in the October 26 episode, "The Helium Insufficiency", which sees Sheldon and Leonard forced to turn to a shady chemical dealer (Rapaport) to secure quantities of the rare gas helium on the black market because of a worldwide shortage.

Read the full story at Yahoo.com

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