As their name suggests, they originate from Mars. They are sent in to destroy Earth after Mittens 2.0 began to exceed Black Cat in the polls.
They were first summoned by Blinky when he threatened to blow up Earth unless Black Cat stayed on top. As a demonstration of his power, Blinky had the fleet destroy Pluto.
Later, when Black Cat starts getting beaten in the polls by Mittens 2.0, Blinky summons them to invade and destroy Earth. The armada carried out attacks across the globe, before clashing with the Laser Cats when they were sent out to stop them.
The armada was later destroyed when the Dog Wizard's boombox makes all the Mittens 2.0s crash into the spaceships, destroying them.