Battle Mania 2
The genesis was known for it's incredible shooter library and one of the standout titles was Battle Mania. The first Battle Mania came to the US as Trouble Shooter after a large amount of editing. The sequel Battle Mania 2 never made it to US shores and is even better than the first game.
This version of Battle Mania 2 is fully translated into English and will play on any US genesis system.