Shannon Baker

Still distraught over her breakup with Clark, Lana experiments with a dangerous serum that allows her to flatline and see her deceased parents again. A worried Clark rushes to save Lana from hurting herself but ends up being injected with the kryptonite-laced serum by an arrogant medical student. When Clark flatlines, he is able to talk to his dead father, who warns him that Lionel knows his secret. Meanwhile, Lionel continues to get closer to Martha.

Max and Ellis are pulled into the undercover world of espionage and counterintelligence when a bride becomes the target of an unusual murder attempt on her wedding day.

The CSI unit faces the final showdown with the Gig Harbor killer whose motives are finally revealed. Meanwhile, Nick Stokes makes a decision that will affect the entire team moving forward. Guest stars include Mark-Paul Gosselaar as Paul Winthrop, Mark Valley as Detective Daniel Shaw and Eric Roberts as Daniel Larson.