1991 · Hexagames (I)
Players represent alien races that are seeking to spread themselves onto five foreign worlds. To accomplish this, they make challenges against other players and enlist the aid of interested parties. But alien powers, which are unique to each race, give players ways to bend or outright break some rule in the game.
This is an updated version of the original Eon Cosmic Encounter (1977).
Major differences between this version and the Eon version:
Flares in the Mayfair version are "use once and discard", as opposed to Eon's version, which lets players keep them in their hands and reuse them.
Mayfair introduced phase / timing icons on all Powers, Flares, and Edicts to clearly indicate when each could be used.
Mayfair introduced new Edicts, and several new Alien Powers with corresponding Flares.