CYBORG JUSTICE!
That is the greatest Sega Genesis game in existence. Heck, it may be the greatest game in existence period.
At a glance, it is just like every other brawler on the Genesis, side scrolling, enemy waves, environmental traps, etc. But there are a few key differences: for one, you are giant robots (or maybe normal sized robots, you never really know). You custom design your robot from the start with a variety of torsos, arms and legs, each granting the cyborg a different special ability. These range from different attacks to being able to jump incredibly high. Secondly, you can dismember and tear apart the enemy robots at a whim, and have the option of taking their parts and using them instead of your current setup. Want those heavy legs on that guy? Rip them off and stick them on yourself. In need of some health? Rip that guy apart and absorb his torso. Good times. Thirdly, it's called CYBORG JUSTICE! I mean, come on! Try to think of a game with a more awesome name than that.
Didn't think so.
The game can be played with two people (obviously, its a brawler on the Genesis) and can provide some great hilarity if played past 2 in the morning.