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.
List of Metalocalypse characters
Edgar returns in the 2nd Season as the secondary villain of the Season (the Metal-Masked Assassin acting as the main villain). The shock of his brother's death, as well as the brutal torture inflicted upon him by the band's minions, drives Edgar insane: having recovered the remains of his brother's face from the incident, he makes them into a mask for a fellow imprisoned fan who is put into his cell, even referring to the teen as his brother upon doing so. He digs his way out of the prison in the episode "Dethvengeance," the fan tied to his back despite the latter not being handicapped. He is rescued by the Metal Masked Assassin after escaping through the sewage system. He and the assassin start the Revengencers and begin orchestrating terrorist attacks on different Dethklok-related places. The Tribunal describes Edgar as the brains behind the terrorist attacks. He has his nose bitten off by a Dethklok fan while attempting to assassinate Nathan, in the episode "The Revengencers" aka "Sicklok".