SSO: Parasites

From Man O' Kent Games:

The Omega was carrying a carefully contained and absolutely deadly alien parasite. The carrying and deadly parts are still true. Mission control is very clear that you should at all costs avoid contact with the parasite.

They're just not very clear on how.

Whether in the classic Who Goes There or John Carpenter's big screen version The Thing, what's certain is that with an alien parasite in the mix pain and paranoia won't be far behind. Infection is certain, survival is not.

New "Permanent" cards mean that infected crew can lose control and threaten the mission. At first, careful movement control and partial quarantine will serve to control the outbreak. But it will spread, and eventually more extreme measures may become necessary.

This is an expansion. It cannot be played without the SSO: Base Game.