The Invincibles Alien Forces

Its year 2085. A Sapient alien race called Cardassien, invades earth and releases the universes most dangerous weapon on planet - The Flood.
The Flood is a parasitic virulent life form. They are highly virulent and deadly race, and can quickly incapacitate and infect different life forms, but the infected subject must have sufficient body mass and some level of sentience to sustain the infection forms, such as a Human.
The game put you in role of a Humanoid Cyborg, who is the member of Intergalactic security Forces called "The Invincibles".
You must defend the earth and kill all alien infection trying to destroy the earth.
The Floods constantly are teleported to earth from the time vortex of the Cardassien spaceship.