Madelyne Pryor

Madelyne always bore a striking resemblance to the (then) presumed deceased Jean Grey. Numerous individuals mistook her for Jean reborn. To make matters more suspicious, Madelyne's mind was closed to Professor X and she was the sole survivor of a mysterious plane crash, which occurred at the exact moment the Dark Phoenix committed suicide on the Moon, or so she thought.

In reality, she was a clone of Jean created by Mister Sinister. Mr. Sinister found that a union between the X-Men, Scott Summers (Cyclops) and Jean Grey (Marvel Girl), would produce a powerful mutant. Sinister hoped he could control such a mutant and use it to defeat Apocalypse.

At the time, Jean, actually the Phoenix, was acting recklessly, so Sinister created a clone of her. Sinister's plot was to produce a child from the union of Madelyne and Scott, whom he believed would become a genetically superior mutant. To Sinister's disappointment, Madelyne had no life and did not develop any mutant abilities at puberty as he had hoped. Sinister left Madelyne in her incubation tube as a failed experiment.

Madelyne's resurrection has gone pretty much unnoticed by her former allies and enemies for years, much to her dismay. When the nation of Krakoa was established, Madelyne represented a unique exception, not being invited to join the rest of her race. A resentful Madelyne made vengeance plans against Krakoa for excluding her. She took control of Sinister’s former cloning lab, where she was able to resurrect undead clones of the Marauders and control them as she wished. Planning to clone hundreds of Marauders, Madelyne would then lead her army of undead into the Krakoan gates, ravaging the paradise she was denied.

Sinister sent his Hellions, a team of Krakoan disreputable mutants which included Havok as a member, to destroy his abandoned cloning lab. As the rest of the Hellions clashed with the undead Marauders, Madelyne tortured Havok and intended to sacrifice him as part of a ritual to fill the bodies of the resurrected Marauders with demon essences. Her scheme was interrupted by Greycrow, who shot her dead. Madelyne died in Havok's arms, begging him to remember her as a real girl. Later on, Madelyne's resurrection was dismissed by the Quiet Council of Krakoa, with Jean Grey voting against it.