Investigating a lethal toxin that was unleashed on a wedding ceremony as a weaponized experiment, Walter uncovers an alarming formula that reveals a link to the Bishop family tree.
Clark investigates a recent attack and fears it is the work of a serial killer. Davis fears his blackouts may mean he is the serial killer and confesses his suspicions to Chloe.
Jimmy snaps a picture of Clark speeding to save Lois from a mugger and manages to catch a red and blue blur on film. Tess decides to run it on the front page of the Daily Planet.
