Armitage, a saucy Martian cop, and her partner, Sylibus, track a killer who is revealing his female victims' identities as highly-advanced androids. Sylibus discovers that Armitage is one of them before witnessing her dramatic standoff with the murderer.

The killer, D'anclaude, is in custody, but the androids, called Thirds, are still dying. Armitage's disappearance leads Mars PD to suspect that she's involved in the murders. Only Sylibus knows why she has taken the case into her own hands.

Armitage desperately searches for connections between D'anclaude and her father, who designed the Thirds. She and Sylibus reunite to battle police forces and abduct the killer for questioning, where they are confronted by a crazed D'anclaude robot clone.

Sylibus and Armitage locate her brain-washed father at a secret base on Dunwitch Hill, where their questions about the Thirds are finally answered. Armitage receives wicked battle upgrades before a final showdown with the Martian military.