J. Allen Carter was an Earth astronaut on a survey mission to Mars. In truth, this J. Allen Carter was in fact a spy for the Imperium, who impersonate the real J. Allen Carter.
History[]
During the mission he inadvertently released the Imperium from their centuries-long imprisonment and was presumably killed in the process. An Imperium soldier assumed Carter's identity and was elected to the U.S. Senate after his return to Earth.
Carter's doppelganger promoted a program of global disarmament in preparation for the Imperium invasion. The doppelganger was killed when the Imperium was defeated on Earth.
Background information[]
J. Allen Carter is a reference to John Carter, the protagonist of many novels by Edgar Rice Burroughs which were set on a fantastical version of Mars, as is his fellow astronaut, Ed Reiss.