Alien Front Online happened in 2001.
Alien Front Online was created on 2001-08-09.
Heiankyo Alien happened in 1980.
Alien Swarm happened in 2010.
Alien Syndrome happened in 1987.
Alien Storm happened in 1990.
Alien Incident happened in 1996.
Alien Highway happened in 1986.
Alien Legacy happened in 1994.
Alien Shooter happened in 2003.
Alien Cabal happened in 1997.
Alien Carnage happened in 1993.
Alien Crush happened in 1988.