Corruption mod for Half-Life 2

This is a sci-fi mod that will powered by the source engine. So far only planned as multiplayer, but has the possibility to have singleplayer to. Multiplayer wil consist of deathmatch, team deathmatch, and capture the flag. And the story...

Half of the population goes down to a planet to research it to figure out if its inhabitable, they need the resources. Their numbers are limited do to the resource shortage. When the aliens land they do they're tests and research, and stay there for 2 weeks. At this point a majority of alien researchers come under a bad fever, they decide to head back to the mother ship. They board their ship and go into cryogenic sleep chambers since the trek back is a month away. A week after leaving the planet the aliens begin to change, in their slumber it they can do noting. Their skin color begins to change to a light gray, their skin starts to split, a infection is occurring. By the end of the month their ship is nearing the mother ship. By now the aliens that are returning from the planet are completely under come by the... virus. But in reality it not a virus at all, its a parasite, a parasite that plants itself in the brain of the host. The body looses it sense of control, the alien can no longer control it self. Now the only thing parasite wants to do is.. feed