Star Trek: Enterprise: Season 4, Episode 19

4 - 19: In a Mirror, Darkly (2)

In the mirror universe, power-hungry Archer and the crew use the 23rd-century Defiant to thwart a Tholian attack and its advanced weaponry to put down a rebellion setting their sights on seizing control of all of Earth's Terran Empire. But first, he must rid the ship of a deadly Gorn stowaway.