Mecha-Ridley

Mecha-Ridley, sometimes called Meta-Ridley and such, is a robotic form of Ridley. It should be noted that Mecha-Ridley is not the true Ridley, but merely an attempted remake by the Space Pirates.

Metroid:Zero Mission
In Metroid:Zero Mission, Mecha-Ridley appears as the final boss. Unlike Ridley, Mecha-Ridley cannot fly, and relies on his claw, lasers, fireballs, etc. To defeat Mecha-Ridley, Samus must hit a small tank on the bottom of him that is his computerized brain. Once smashed, Mecha-Ridley will shut down, leave behind a bunch of health, and signal an alert to the Space Pirate Mothership's main computer to self-destruct. You are then left with six minutes to get to a Space Pirate ship in the docking bay and leave before the Mothership explodes.