Season 7 Episode 22 episode 22

The Big Bang Theory Season 7 Episode 22 “The Proton Transmogrification” Photos

The Big Bang Theory Season 7 Episode 22 “The Proton Transmogrification” Photos

The Proton TransmogrificationProfessor Proton helps Sheldon cope with grief, while Leonard turns a relationship milestone into a competition with Penny.

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Check out the sneak peek images for "The Proton Transmogrification" (airing on May 1) in the gallery below:

Source: CBS