Terra Prime forever.
~ Paxton, in his address to Starfleet Command

John Frederick Paxton is a character appearing in the fourth and final season of Star Trek: Enterprise, serving as the main antagonist of the episodes "Demons" and "Terra Prime," which comprise a two-part story.

He is portrayed by Peter Weller, who also played Alexander Marcus in Star Trek Into Darkness.

Paxton is the leader of Terra Prime, a human movement dedicated to maintaining the genetic purity of humankind, and is also the head of the Orpheus Mining Colony stationed on Luna, a position he inherited from his father.

Paxton orders the creation of a Vulcan/human hybrid created from the DNA of Enterprise crewmembers Commander Charles Tucker III and Commander T'Pol to serve his goal of creating an Earth free of alien influence. Tucker and T'Pol learn of their daughter's existence and go undercover on Orpheus, only to be discovered by Paxton's men and brought before Paxton.

Paxton makes known his intentions to put an end to what he views as the contamination of humankind by extraterrestrials and returning Earth to its rightful owners. He then reveals that the Orpheus Mining Colony is actually a starship, which he commands to leave Luna and travel to Mars, where he's able to use the ship to take control of the Veteron array (used to deflect meteorites).

Once in control of the Veteron array, Paxton broadcasts a message to Starfleet Command and the United Earth government, demanding that all aliens vacate Earth lest he use the Veteron array to fire on San Francisco, where Starfleet Command (whom he holds responsible for Earth's so-called contamination by aliens) is situated.

T'Pol figures out that Paxton has Taggart's Syndrome, a disease that should have killed him many years ago, and that he takes injections of Rigelian gene therapy to manage his condition. She confronts Paxton with his hypocrisy, but Paxton is adamant in his agenda.

Paxton is later confronted by Captain Jonathan Archer, and the two men face off. He mockingly compares Archer to his late father Henry Archer, saying the elder Archer was so desperate for the secrets to achieving warp flight that he willingly became the Vulcans' "pet human." Archer ignores Paxton's taunts and takes him down.

It is unknown what happens to Paxton after his defeat, though his actions have serious consequences. Firstly, the cloning process his scientists used to create Tucker and T'Pol's daughter proved fatal to the infant. Secondly, Paxton's actions endangered a prospective Coalition of Planets, but an impassioned speech delivered by Archer salvaged the Coalition.

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