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.
Ridley (Metroid)
Throughout the series, Ridley has undergone a variety of changes in appearance. In the original "Metroid" title, he was roughly the same size as protagonist Samus Aran and sported a more alien appearance (particularly in official artwork, which depicted him with eight eyes running down the length of his head and a small, lamprey-like mouth). In "Super Metroid", he is larger than in the original title several times over, sporting purplish-brown skin, glowing yellow eyes, chameleonic abilities (possibly explaining his inconsistent skin tone across different games and even within different parts of "Super Metroid"), and an overall body shape that heavily resembles a European dragon. Later games depict him as larger still, and "Other M" departs from previous depictions by giving him a bulky, muscular form in contrast with his skeletal appearance in previous games, along with completely purple skin and flattened jaws resembling a pointed duck bill with a noticeable underbite. Ridley's vocalizations were first depicted in "Super Metroid" and took the form of a predatory screech; later 2D titles instead gave him piercing, high-pitched wails, while 3D installments such as the "Prime" games and "Other M" had him perform monstrous roars. His cybernetic form during the events of the "Prime" series is referred to as Meta Ridley and incorporates various ballistic weapon systems, while a robotic duplicate, Ridley Robot, appears as the final boss in "Zero Mission". While he did not originally appear in "", in the 3DS remake "", Ridley returns as the game's final boss in a new cybernetic form called Proteus Ridley in an attempt to steal the last living Metroid before Samus can deliver it to the Galactic Federation, though he is defeated once more. In the new title of the "Super Smash Bros." series, "Super Smash Bros. Ultimate", he is shown as he was in "Super Metroid", with a darker, purplish tone to his skin and with a size scaled to his original appearance in the first Metroid title, although he has an alternate costume resembling Meta Ridley.