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Sleeper agents were soldiers used before an invasion by Cell 114, a species of which very little was revealed, though Jack Harkness knew of them. Apparently, they were often modified to resemble the species that is to be invaded, and are used to gather intelligence on the species and planet.
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A sleeper agent
The sleeper agents of this species disguised as Humans on Earth had implants which could take the information and transmit it to the main invasion fleet. These implants even had built-in weaponry such as spikes and explosives. (TW: Sleeper)