Magneto

Magneto's voice was provided by David Hemblen in the series X-Men, where he played a prominent role. Curiously, though he began on the show as a villain, his character spent more time as an ally to the X-Men, fighting alongside them against common enemies such as the Sentinels and Mr. Sinister as opposed to the cold-hearted villain other medias had portrayed him as.

In the series, he first appears in the third episode Enter Magneto, where he attempts to begin a war between humans and mutants by attacking a military base and launching its nuclear armament, though they are prevented from reaching their targets by the X-Men. He reappears in the next episode Deadly Reunions, when he attacks a chemical plant in an effort to draw Xavier out to face him. After defeating Cyclops, Rogue and Storm, Xavier meets his challenge and they do battle. Though Magneto gains the upper hand, Xavier tortures him with repressed memories of his childhood during The Holocaust, causing Magneto to flee in agony. In the first season finale, he kidnaps Senator Kelly in order to once again attempt to begin a war, but is thwarted by a group of Sentinels. After Mastermold and the other Sentinels rebel against their creators and become a threat to the entire world, Magneto allies himself with the X-Men and they successfully eliminate the Sentinels, during which he saves Xavier's life in exchange for their earlier rescue of Magneto.

He appears in nearly every episode in the second season, in which he and Professor Xavier are powerless and travel throughout the Savage Land. At the end of that season, all of the X-Men save them from Mr. Sinister, and they regain their powers.

In the fourth season, he helps defeat Apocalypse. Later on, he creates Asteroid M as a safe haven for mutants who feel persecuted on Earth. Though his intentions are noble, a betrayal by his closest servant Fabian Cortez puts into motion a series of events after which he realizes that the world will never again trust him as the leader of the Asteroid, and he allows the base to be destroyed. Disheartened by the loss of his sanctuary, he does not care about even the impending assimilation of mankind by the Phalanx, until he receives news from the Beast, Forge, Mr. Sinister and Amelia Voght that his son, Quicksilver, has been kidnapped by the Phalanx in the second part of the two-part fifth season premiere. He teams up with them to defeat the Phalanx and save everyone they had captured or assimilated.

By the end of the series, he has gathered up an entire army of rebellious mutants, and is poised to conquer the world, but receives news from Wolverine, Cyclops and Jean Grey that Professor Xavier is dying. Relenting, Magneto uses his power in conjunction with Xavier's in order to contact Lilandra Neramani, who takes Xavier to her planet where there is a suggestion that he may be cured.