The Key, because we're in a sci fi mood lately here at XUL we decide to unload this classic slab of even more classic death metal atcha. We could tell you the usual dull "Pioneering band with use of keyboards, they had a lot of leads and Mike Browning of Morbid Angel fame was in them until they had internal conflicts and blah blah blah", but that's too easy and amateur. What you really need to know is that there is a multi-song theme of CAPTURING INVADING ROBOTS TO BUILD A TIME MACHINE TO GO BACK IN TIME AND KILL BABY JESUS IN ORDER TO FORM AN EMPIRE TO AWAIT THE FUTURE INVASION.
If you read that and don't instantly go "Fukk yeah!" then really, I don't know what to tell you other than you probably have watched one too many chick flicks in your lifetime.
DIE BY THE SIGN OF THE KEY