Ridley (Metroid)
One of Adam's final missions to Samus is to finish off Ridley, whom Adam fears might be more dangerous than the Metroids if left unchecked, and claims Samus is the only one capable of stopping him. However, Samus later discovers his corpse after he is killed, having had his energy drained by the Queen Metroid on the Bottle Ship. His mummified corpse turns up again in "Metroid Fusion" on the BSL station, after having apparently been removed from the Bottle Ship by the Galactic Federation and placed in a sub-zero storage room for further research (potentially into further bioweapon applications). It is later infected by an X Parasite, allowing it to gain the ability to transform into Ridley's likeness, known as . Samus later defeats the Ridley mimic and absorbs its Core-X, regaining her signature Screw Attack. What was left of the cloned Ridley's remains were destroyed along with the X when the BSL station crashed into SR388.
Characters in the Metroid series
is a gigantic dinosaur-like beast and a member of the Space Pirate's High Command. His most prominent feature is his grotesquely oversized belly. First appearing in the original "Metroid", he is the first part of the mini-boss duo along with Ridley. In "Super Metroid" he appears in his giant form, two screens tall and almost a screen wide. "Metroid: Zero Mission" retconned his size and appearance, showing he did not grow between games. He was also slated to appear in "Metroid Prime" as a boss in the Phazon Mines, with a metal dome covering his head and blue Phazon veins on his belly, but was removed due to time constraints. Kraid also makes an appearance in the background of the Brinstar Depths stage in "Super Smash Bros. Melee" and "Super Smash Bros. Ultimate" where he periodically slashes and rotates the stage.