Determined to scorch Starfleet Command in San Francisco if Earth refuses to abolish a proposed interplanetary alliance and make all aliens leave Earth immediately, Paxton blackmails Trip into modifying his doomsday weapon, the Verteron array on Mars. Archer and a handpicked team infiltrate Terra Prime's Mars headquarters to stop Paxton. Hoshi takes command of Enterprise as a traitor lurks within the crew. Elsewhere, the origin of Trip and T'Pol's child is revealed.