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.
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.