Star Trek: Enterprise - Season 4 Episode 21 -

Determined to scorch San Francisco if Earth refuses to abolish a proposed interplanetary alliance, Paxton blackmails Trip into modifying a doomsday weapon; while Archer and a handpicked team attempt to infiltrate Terra Prime's Mars headquarters. Elsewhere, the origin of Trip and T'Pol's child is revealed; and Hoshi takes command of Enterprise as a traitor lurks within the crew.