eXtinction is a 3D sidescrolling platformer/shooter.

You are Nick Naster, the most talented and the best trained interplanetary agent. You've been chosen to stop an alien invasion and a virus infection on your home planet Tera 2. The scientists have discovered, that the virus infects human soldiers making them able to carry alien embryos inside them.

Any contact with the planet's atmosphere will infect you unavoidably. You were given the last drops of the antidote, that was made, shortly before the biolabs on Zeta 2 have been destroyed. All records of the said antidote have been lost with it, there is no one to help you anymore.