Season 1, Episode 12 The Alchemist

First Aired: January 20, 2014

The team goes undercover to pursue the Alchemist, who uses science to transform DNA and who's been assigned to protect a mob informant. Elsewhere, Liz targets an unlikely couple; Tom and Liz's relationship is tested; and Ressler faces a big decision.

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Guest Cast

Ryan O'Nan The Alchemist