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.
Shao Kahn
Shao Kahn and Darkseid are the key villains in the crossover game "Mortal Kombat vs. DC Universe", though both are playable characters. In the game's plot, a defeated Shao Kahn limps into a graveyard where he meets with his secret ally Quan Chi. They are confronted by Raiden, who uses a lightning bolt on Shao Kahn, which knocks him into Quan Chi’s portal. This event, along with a parallel one between Superman and Darkseid in the DC Universe, results in the creation of Dark Kahn, who serves as the main antagonist in the game. After Dark Kahn is defeated, Shao Kahn ends up in the DC Universe's Darkseid's throne room, where he discovers he has lost his powers. He is promptly imprisoned in the Phantom Zone. However, his powers came back in little time and was able to free himself but also everyone in the Phantom Zone, whom pledge allegiance to Shao Kahn.