Ridley (Metroid)
Ridley returns in his Meta form once again in "", where he, along with the Space Pirate legion under his command, are corrupted by Dark Samus. He encounters and battles Samus on Norion, a Galactic Federation-occupied world, and the two fight while free-falling down an air shaft. Ridley is later supercharged with Phazon, becoming "Omega Ridley", and is charged with guarding the Leviathan Seed on the Space Pirate homeworld. He is confronted once again by Samus, and despite being defeated, he survives the fight and is later cured of his corruption after Dark Samus' defeat later on. Between the "Prime" trilogy and "", the Space Pirates reorganize on Zebes and hatch another plan to clone and weaponize the Metroids, while Ridley gradually begins to regenerate from his past injuries, gradually shedding his cybernetics. In the remake of the second game, "", Ridley, in his semi-regenerated form of "Proteus Ridley", attacks Samus on SR388 to steal the last remaining Metroid. Samus and the baby Metroid work together to defeat Ridley.
Metro 2033
Although Polis do not agree to intervene, a faction known as the Brahmins (who consist of scientists and academics who collect books from the library above), contact Artyom. They offer a solution to the threat of the Dark Ones in exchange for Artyom's help in recovering a sacred book, as they believe him to be psychically sensitive. Artyom travels to the surface with Melnik and young Brahmin called Daniel. They enter the library and are attacked by the 'librarians', mutated creatures that reside there. Daniel is mortally wounded, but before dying, gives Artyom his reward anyway. It is an envelope containing directions to a functioning missile silo. Artyom and Melnik flee without the book and re-enter the metro, arriving at station Kievskaya. Melnik leaves Artyom at the station while he goes to collect reinforcements but whilst he is away, Artyom becomes involved in the search for a missing child. Artyom and the child's father are abducted by a tribe of cannibals who worship 'The Great Worm'. They are rescued by Melnik and a squad of fighters and they escape into Metro-2, a secret set of tunnels that lead to the missile site.