ABYSS

The year is 3001. Mankind has conquered the galaxy and established an alliance to protect peace in the known space. The galactic federation of the ninth planet sends a man into deep space on a confidential operation known as "Abyss". However, the commander is captured by a criminal syndicate. His memory is erased, and he is rendered unable to communicate with his allies. His goal is to escape and find a way to return to the mother ship.

[From mobygames]