For his regular form, see Ridley.
Meta Ridley first appeared in Metroid Prime. After being badly wounded by Samus in Metroid, Ridley was revived by the Space Pirates using cybernetic technology. He was equipped with additional weapons, including a mouth beam, missiles and energy bombs. Samus first sees him while trying to escape the Frigate Orpheon. She quickly pursues him in her ship to the world of Tallon IV, but loses him. She briefly sees him in the Phendrana Drifts, but their final confrontation comes when Samus attempts to access the Impact Crater. Meta Ridley's weak points are his mouth and chest. Eventually, Meta Ridley's wings burn, so he battles Samus on the ground, and is still lethally fast. Despite this, Samus defeats him.
Meta Ridley returns in Metroid Prime 3: Corruption. When the Space Pirates attack Norion, Samus sees Ridley wipe out several Galactic Federation Marines. He briefly harasses her as she goes through an exposed rail while in Morph Ball form. When she goes to activate a reactor, Meta Ridley pounces her and they begin a free fall battle down the reactor shaft. Again, Meta Ridley is defeated and Samus is saved at the last minute by fellow bounty hunter Rundas. Ridley, however, still survives. When Samus goes to the Pirate Homeworld to destroy the Leviathan Seed, a large living meteor that corrupts planets with Phazon, she finds that Ridley is guarding the core. He is now enhanced by Phazon and appears as Omega Ridley. Still, he is defeated and returns to his organic form in Super Metroid.
As with Ridley, many of Meta Ridley's attacks are new in Brawl; however, there are a couple attacks that are retained: In Metroid Prime, one of the attacks that Ridley uses is shooting fireballs at Samus. The fireballs that Meta Ridley shoots in Brawl are designed similarly to how they are designed in Metroid Prime. In Metroid Prime 3: Corruption, right in the middle of the fight between Samus and Ridley, Meta Ridley will grab Samus and try to perform a powerful attack. One of the attacks involves charging up a fireball and firing it at Samus. In Brawl, Meta Ridley charging and firing his fireball is very similar to how he performed it in Metroid Prime 3, except he doesn't grab onto a player while doing it.
Role in The Subspace Emissary
After R.O.B., Captain Falcon, Donkey Kong, Diddy Kong, Pikachu, Samus and Olimar make their way out of the doomed Bomb Factory flying away in the Falcon Flyer, they are attacked from behind by the resurrected Meta Ridley, who is out for revenge on Samus and Pikachu. As such, he serves as the seventh boss.
Meta Ridley's attacks can additionally send the Falcon Flyer reeling about. In this battle, he is attacking the ship as well and the player has 2 minutes to beat him, similar to the battle in Metroid Prime 3. He has completely different moves from Ridley and the player has to jump whenever he hits the ship or the player could fall. He is later defeated and the massive amounts of Subspace Bombs explode, covering the island in Subspace, taking everything in it, including the remains of Meta Ridley, into the Subspace. Tabuu, the leader of Subspace, revives Meta Ridley in The Great Maze to attack the heroes (oddly, Ridley and Meta Ridley each appear separately in The Great Maze), but is defeated once again, presumably leaving him dead.
Trophy Stands appear frequently due to the limited time, even on easy difficulties, especially if the character is equipped with a strong Trophy Stand producing Sticker.
Like all bosses Meta Ridley is controllable in Boss Battles Mode by hacking. The start button self-destructs him. Unlike any other boss (besides of Petey Piranha) however, Meta Ridley starts in a T-pose until moving, which is probably the reason he starts moving immediately when the level starts when controlled by an AI.
HP and damage taken
Like all bosses in Brawl, Meta Ridley gains an additional ×0.6 damage resistance modifier when fought in co-op mode, effectively gaining 67% more health. This modifier is applied whenever the second player is in-game, and is no longer applied if the second player loses all their stocks.
During Meta Ridley's attack where he drags the Falcon Flyer down while shooting fireballs, if he is defeated right when he lets go, the Falcon Flyer will continuously fall, instead of bouncing back up as normal
The meta form of Ridley, revived using the Space Pirates' genetic engineering and cybernetic technologies. His thin chest plate--and weak point--is protected by a highly resistant membrane. Meta Ridley is highly mobile and features a multimissile system, a bomb launcher, and powerful wings. Ice attacks are particularly effective in dealing damage to him.
Ridley appears as the Pyrosphere's stage boss. After taking enough damage, he increases his strength by absorbing energy from the generators underneath the main platform on either side, consequently darkening his skin and giving off a purple glow. His appearance in this form is taken from Metroid: Other M when he renders himself invulnerable to Samus's Plasma Beam. In SSB4, this change merely increases his strength.
The 50-Fact Extravaganza gives this form the name "Meta Ridley", although this usage of the name has no basis in the Metroid games. This is actually an alteration made by the English translation of the video; in the Japanese version, this form of Ridley is named 黒リドリー, which is more accurately translated as "Black Ridley".
Main article: Ridley (SSBU)
Meta Ridley appears as an alternate costume for Ridley, using his design in the original Metroid Prime as the basis of his model. Meta Ridley also has a silver and green palette swap as a reference to Mecha Ridley, the final boss of Metroid: Zero Mission.