Emerging from the warp in the latest incarnation of Cosmic Encounter is the Parasite!
You have the power to Infest. Alliances play a huge role in how the game shapes up. Every member of the winning side (provided they are the attackers) gets to place a colony on the loser's planet. The Parasite lets you join a side whether they want you to or not. This can force opponents to choose a different target for their attack, ie. one with one of the Parasite's colonies already on it. While this leeching off of the attack my make you a target, it also allows you to rally the defenders and help out on defense. Use this to your advantage.
Each week leading up to the launch of the new FFG Cosmic Encounter, you can get a new preview of an alien race from the game.