"No matches found in flora and fauna databank"

The subject of this article is not named in-game.
The current title is from a guide or other published source.

For other uses of the name Ridley including cybernetically-enhanced versions of him, see Ridley (Disambiguation).

The Ridley Robot[1] (メカリドリー Mekaridorī?)[2] is the final boss in Metroid: Zero Mission.


The Ridley Robot is an incomplete robot built by Ridley as a powerful weapon in his own likeness. The robot is said to be missing its walking and flying units,[3] thus it has large cables coming out of its torso which are seemingly connected to an unseen interface for power and/or computer control.

It first appeared in the cutscene which plays when Samus infiltrates the Space Pirate Mother Ship for the first time; the scene consists of one of Ridley Robot's eyes opening, signifying that it either activated or detected Samus entering the complex.

After Samus explores the majority of the Chozodia temple and the Space Pirate Mother Ship, she eventually reaches a large, dark chamber located several rooms behind the vessel's control bridge. This is where the mechanical construct, the Ridley Robot, is maintained. As the door locks behind her, loud, screeching, mechanised noises start to resonate in the room as the Ridley Robot uses its arms to crawl towards Samus' location, with its green neon lights glowing in the darkness. Eventually, the chamber lights up and the battle begins.


Mecha ridley

Samus battles the Ridley Robot

Samus must first fire Missiles or Super Missiles at a small, glass-encased panel on his chest covering a weak point resembling Meta Ridley's. Once broken, direct damage can be dealt on the Robot. Only concussive weapons will harm it; Beam weapons have no effect. Because Missiles are limited, the only way to regain them is by shooting down Ridley's own projectile missiles.

Throughout the battle, the Ridley Robot will attack with a claw swipe using its right arm. At the beginning of the battle, it may also attack by launching large fireballs from its mouth. Once the glass panel is broken, it stops breathing fire and will instead launch homing missiles from its backpack and shoot laser beams out of its eyes.

The Ridley Robot deliberately lowers its head and lifts its right claw in an attempt to block her attacks with its neck joint. However, when it attacks, it moves out of this defensive position, exposing its vulnerable chest. In particular, whenever it performs its swipe attack, its claw lingers on the floor for several seconds, giving Samus ample time to counterattack.

If Samus collects all 100% of the hidden items prior to arrival, the Ridley Robot's offensive and defensive power will triple, making for a longer and more difficult battle than normal.

Once defeated, Ridley Robot will shut down and cause the Mother Ship's self-destruct countdown to begin, leaving Samus with 7, 5 or 3 minutes (depending on the difficulty level) to escape the ship.

Development RoomEdit

Warning: Fan Translation(s) Ahead

This article, section, or file contains text that is unofficially translated by Wikitroid editors. Some information (such as proper English names of characters or items) may not be accurate. If an official translation becomes available, the fan translation(s) may be replaced.

Hiroki: "At the very end of the second part, why does a robot similar to Ridley appear? Was the Ridley defeated on Zebes revived by the power of Planet Zebes's science?"

Yoshio Sakamoto: "Ridley made an image of himself to demonstrate his power by making that image as a powerful weapon. Incidentally, it is currently incomplete, and is currently at the halfway stage, becoming more massive once the walking unit and flying unit is installed."[3]



Ridley Robot sees Samus's entry.

  • It is quite possible that the Robot was a prototype, serving as a testbed for the technology later implemented on Ridley's body to create Meta Ridley. This is supported by their shared weakness and overall mechanical aspects. This theory is further supported by the fact that Zero Mission is, chronologically, a direct prequel to the events of Metroid Prime, where Meta Ridley is featured.
  • The Space Pirate Mothership's alarm is active throughout the entire battle against Robot Ridley. It stops as soon as the robot is defeated.
  • The Ridley Robot's eye, as seen in the short cutscene when Samus first enters the Space Pirate Mothership, is similar to the computerised Adam's eye from Metroid Fusion.
  • The glass panel covering its weak point seems to be made out of the same transparent material as Mother Brain's Control Capsule, as both can only be shattered by concussive weapons.
  • Concept art from the Prime trilogy shows a massive mechanized Ridley with wings and an apparent pilot, though it remains unknown whether or not this was intended to be related to this robot.
  • In Super Smash Bros. Ultimate, one of Ridley's alternate costumes is colored silver with neon green highlights, referencing the design of the Ridley Robot.



  1. ^ Metroid: Zero Mission: The Official Nintendo Player's Guide pg. 97
  2. ^ Metroid: Zero Mission ミッション・コンプリートブック [1], which is often romanized as Mecha Ridley by fans
  3. ^ a b Metroid Zero Mission Official Site Development Room, as translated by Metroid Database