Brian Catalano

Zoe and Lightman fear they sent an innocent man to his death when a man they prosecuted 17 years ago is executed.

J.D. (Zach Braff) strikes up a romantic relationship with an attractive social worker (guest star Elizabeth Bogush, "Beverly Hills, 90210") but he soon learns that Elliot (Sarah Chalke) is not only jealous but thinks his new squeeze is bad news. Meanwhile, Turk (Donald Faison) discovers that Dr. Cox (John C. McGinley) also has romantic designs on Carla (Judy Reyes) while Carla encounters hard stares from her fellow nurses when she strikes up a car-pool friendship with the hated Dr. Kelso (Ken Jenkins).

When a religious cult operating in Canada unearths a spacecraft similar to the one Scully discovered in Africa, a plot is set in motion to kill baby William.