Bio: Married to Scott Summers (Cyclops) after Jean has thought to have gone missing.
Clone of Jean Grey created by Mr. Sinister. Mr. Sinister would put false memories into Madelyne in order to fall in love with Scott and have a child that Mr. Sinister would control. A child was born, Nathaniel Summers. After Jean was discovered alive Scott ran to her, leaving Madelyne behind. Mr. Sinister would kidnap the child and attempt to kill Madelyne. Believing Madelyne dead Scott would resume his romance with Jean, causing Madelyne to become greatly upset and jealous, and in this state the demon S'ym corrupted her into becoming the Goblin Queen, during which time she would start Inferno.
Notes: Maddie may not have been an "official" member of the X-Men since she is not a mutant, but she certainly became closely associated with the team during their days in Australia. She was presumed killed with the X-Men during the Fall of the Mutants and remained with them until she ignited the Inferno. It was during that final showdown that she took the name "Goblin Queen".