Magneto was one of the main antagonists in Super Smash Bros. Crossover. He is also the father of Quicksilver, Scarlet Witch, and Polaris. Magneto is frequently seen with Tabuu, Dr. Doom, and Orochimaru. Magneto has often clashed with the heroes and gives them quite a challenge despite their increasing strength. Lately, Magneto has been overshadowed by the likes of Sasuke Uchiha, Infinity Mecha Sonic, and Zombie Reed. However, it is important to remember how dangerous Magneto can be. However, Magneto will occassionally team up with the heroes to stop a greater threat. In Season 13, Magneto battles Wolverine and wins, turning Wolverine into a trophy and bringing him to the villains' doomship. In Season 16, following Bowser and Zombie Reed's disappearance, Magneto goes to the Xavier Institute along with Sabretooth, Tabuu, Dr. Doom, Orochimaru, Mag Mel, Yami Marik, and Professor Viper, hoping the Heroes of Legend would know of their location. Magneto later reappears in Season 18, after Sabretooth tells him that Zombie Spider-Man is headed to the Daily Bugle. Magneto tells Sabretooth to head to the Xavier Institute and kill the other zombies that have decided to live on Earth (Zombie Wolverine, Zombie Iron Man, and Zombie Wasp). Magneto is also revealed to have taken command of the other villains after Bowser's departure. Magneto then sends Tabuu and Dr. Doom to save as many people as they can, and sends Orochimaru to keep an eye on Sabretooth while he goes to the Daily Bugle to save the workers from Zombie Spider-Man. However, Magneto is attacked by Yami Bakura, who has possessed Naruto Uzumaki, and is knocked out of the sky, and is then crushed by the revived Anubias and Sellon. Magneto, Anubias, and Sellon are soon ambushed by Zombie Reed, Thrax, Zombie Torch, Zombie Thing, and Bowser. Magneto then becomes enraged that Bowser is working with the undead. Ultimately, Magneto is killed by the zombies, but manages to get the Heroes of Legend to flee. Magneto is later revived as one of Yami Bakura's reanimated soldiers. At the end of Season 19, Magneto is revived by Shenron. In Season 22, Magneto defects from the villains as they have gone too far with their plans.
Magneto's appearance is based off his appearance in Wolverine and the X-Men. On occasion, Magneto will wear an armored version of this outfit.
Magneto, while an antagonist, is not as cruel as Mecha Sonic, Zombie Reed, etc. Magneto doesn't trust Zombie Reed at all as he knows what the zombie plague is capable of. Magneto also trusted Bowser completely, as he was furious when he learned Bowser sided with the undead.