Old sega genesis (megadrive) game info request

Can anyone help?
I rented a video game about 10 years ago, in the U.K for the sega megadrive (genesis) system.
It was a side scrolling beat-em-up....you play a robot and you are fighting a bunch of other robots, all I remember about the game is that once you had beaten up an enemy robot, you could pull off his arms or legs and attach them to yourself as powerup's. Some had buzzsaws and some fired a ray. I really want to get this game again, so can anybody remember the name of it?....(it wasn't B.O.B, before you suggest that).
Many MANY thanks!!