Madelyne was a clone of Jean Grey infused with false memories by Mister Sinister (though neither Jean nor Madelyne knew of the deception). Part of the Phoenix Force, Madelyne was used as a pawn by Sinister to force Cyclops to marry and father a son, whom he could then control. The plan went smoothly and a child was born despite the interference of Mastermind, Loki, and the Genoshans. Madelyne and Cyclops split up when he rejoined Jean Grey in X-Factor. Mister Sinister kidnapped the child and tried to kill Madelyne. Maddie escaped and teamed up with the X-Men, joining them in "death" as a result of their conflict with the Adversary.

They didn't die, but appeared in Australia, where S'ym corrupted Maddie and turned her into the Goblin Queen. Till then, she had no known super-human powers. After turning evil, she acquired:

• Telekinesis: UN rank, with range limited to line of sight.
• Flight at IN air speed.
• Force fields of ShY strength.
• Kinetic force bolts of UN force.
• Matter Control: ShX ability to convert and control various forms of matter. She has developed several power stunts with this ability, too:
• Alter environment, 10 mile radius.
• Transform other humans into demons.
• Create "average" demons from everyday objects.
• Non-detection: ShY ability.
• Telepathy: UN ability, allowing her to encourage the dark side of a victim's personality, making characters more willing to attempt karma-reducing acts.

The Goblin Queen controlls a large horde of "average" demons, also. These demons had the following abilities:

• Claws capable of inflicting TY edged attack damage.
• Flight at TY speed.
• Body Armor providing TY protection from physical and energy damage.

Maddie headed, as Goblin Queen, the demonic invasion of Manhattan known as Inferno. She corrupted some but not all of the X-Men, and fought the X-Men and X-Factor, seeking to kill her child in vengeance against Cyclops. Failed in that attempt, she tried to destroy herself and her opponents, but only she died in the blast.

Lately, she has been seen in X-Man #15. It seems that Nate has revived her as far as we know.

Maddie is now the apprentice of the External, Selene, who killed the rest of the Externals in order to prepare for the coming of Onslaught.