Alien Front Online happened in 2001.
Alien Front Online was created on 2001-08-09.
Alien Crush happened in 1988.
Alien Breed happened in 1991.
Alien's Return happened in 1983.
Alien Carnage happened in 1993.
Heiankyo Alien happened in 1980.
Alien Swarm happened in 2010.
Alien Syndrome happened in 1987.
Alien Storm happened in 1990.
Heart of the Alien happened in 1994.
Alien Brigade happened in 7800.
Alien Attack happened in 1979.