The mirror-universe counterpart of Jonathan Archer, a resentful commander who mutinies aboard the ISS Enterprise, seizes the 23rd-century USS Defiant and tries to make himself Emperor.
In the two-part episode In a Mirror Darkly, Commander Archer is first officer of the ISS Enterprise under Captain Forrest. Convinced that his career has been held back, he mutinies and takes the ship into Tholian space, where a starship from another universe and a century in the future, the USS Defiant, is being stripped in a drydock.
Forrest retakes the ship but still follows the plan, and dies when the Tholians destroy Enterprise. Archer escapes aboard the Defiant, hunts down the Gorn overseer Slar, crushes a rebel fleet and kills Admiral Black when he is refused a command of his own.
Tormented by visions of the celebrated explorer he is in the other universe, he sets course for Earth to claim the throne, only to be poisoned by Hoshi Sato on the eve of his triumph.