Zero Gunner happened in 1997.
Zero Gunner was created in 1997.
Trap Gunner happened in 1998.
Tail Gunner happened in 1979.
Steel Gunner happened in 1990.
Strike Gunner S.T.G. happened in 1992.
Zork Zero happened in 1988.
Zero Divide happened in 1995.
Spaceship Zero happened in 2002.
Zero Critical happened in 1999.
Enemy Zero happened in 1997.
Slave Zero happened in 1999.
Zero Gear happened in 2010.