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.
Metroid II: Return of Samus
"Metroid II" is an action-adventure game in which the player controls the protagonist Samus Aran on the fictional planet SR388. In this side-scroller, players advance through the game by using Samus' weapons to kill a fixed number of Metroid creatures. The player is given a detector that displays the number of Metroids remaining in the area. Once all the creatures are eliminated, an earthquake occurs and the planet's lava levels decrease, allowing Samus to travel deeper through its tunnels. The Metroid creatures are encountered in different evolution stages of their development cycle: original, Alpha, Gamma, Zeta and Omega. The more developed the organism is, the stronger its attack. "Metroid II" features save modules located around the planet, which allow players to save their progress and continue in another session.