- For the cybernetically enhanced version of Ridley seen in Metroid Prime and Metroid Prime 3: Corruption, see Meta Ridley and/or Omega Ridley. For other uses of the name Ridley, see Ridley (Disambiguation).
|Ridley Robot/Mecha Ridley|
|Featured in||Metroid: Zero Mission|
|Location||Space Pirate Mother Ship|
|Attacks||Missiles, claws, fireballs, lasers|
|Weakness||Both Missile types, preferably Super Missiles|
|Reward(s)||Plenty of Energy Capsules|
The Ridley Robot is an incomplete robotic version of Ridley that was built by him, and is the final boss in Metroid: Zero Mission. The robot is said to be missing its walking and flying units, thus it has large cables coming out of its torso which are seemingly connected to an unseen interface, either for power, computer control, or both. 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 eye opening, signifying that it detected Samus entering the complex.
BattleEditAfter Samus explores the majority of the Chozodia temple and the Space Pirate Mothership, 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.
To defeat the Ridley Robot, Samus must fire Missiles or Super Missiles at a small, glass-encased panel on his chest, which resembles the weak spot of Meta Ridley. Only Missiles will damage it; Beam weapons have no effect. It attacks by launching fireballs, homing missiles and laser beams, along with a claw swipe. Noticeably, the Robot moves its head depending on Samus' position in an attempt to block her attacks.
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 Mothership's self-destruct countdown to begin, leaving Samus with 7, 5 or 3 minutes, depending on the difficulty level, to escape the ship.
Because Beam attacks have no effect and Missiles are limited, the only way to regain them is by shooting down Ridley's own projectile missiles.
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." 
- The robot may be a prototype/precursor to the resurrected Ridley who is seen in the Metroid Prime games: Meta Ridley. The fact that both of them share the same weakness supports this theory.
- Concept art from the Prime trilogy shows a massive mechanized Ridley with wings and an apparent pilot; this may be what Sakamoto alluded to, though it was never implemented in a game.
|Bosses in the Metroid series|
|Metroid||Kraid • Ridley • Mother Brain|
|Metroid: Zero Mission|| King Worm • Mua • Kraid • Bug Larva • Kiru Giru • Imago • Ridley • Mother Brain • Ruins Test • Ridley Robot |
|Metroid II: Return of Samus||Alpha Metroid • Arachnus • Gamma Metroid • Zeta Metroid • Omega Metroid • Queen Metroid|
|Super Metroid||Torizo • Spore Spawn • Kraid • Crocomire • Phantoon • Botwoon • Draygon • Golden Torizo • Ridley • Big Metroid • Mother Brain|
|Metroid: Other M||Brug Mass • Fune and Namihe • Groganch • King Kihunter • Mystery Creature • Goyagma • RB176 Ferrocrusher • Rhedogian • Vorash • Ridley • Nightmare • Queen Metroid • MB • Phantoon|
|Metroid Fusion||Arachnus-X • Elephant Bird • Zazabi • Serris • B.O.X. Security Robot • Mega Core-X • Scientist • Yakuza • Nettori • Nightmare • Neo-Ridley • SA-X • Omega Metroid|
|See also: Bosses in Metroid Prime Series|
Little birdie • Mystery Creature • Neo-Ridley Ridley-2
Ultrathermal Flamestrike Projector
Vs. Meta Ridley/Meta Ridley • Omega Ridley