“Covert Action Team”.
The aliens, Kheran and Daemonite, fighting over supremacy to control earth.

The Daemonites have the ability to possess humans. Can only be killed with mindblasts. Their goal, as revealed in the series, was to return home to their planet. Only a special key can unlock the spaceship to take them home. And they have no qualms about murder and wanton destruction to achieve their goal.

The Kherans basically are out to stop them.

At one point, Wildstorm also enters into the plot.

Collects the full run of the WildCATS series and also related stories from Wildstorm Rising, Team One: WildCATS, and WildCATS Annual.