Madelyne Pryor/Goblin Queen

Madelyne Pryor is a clone of Jean Grey created by Mr. Sinister to infiltrate the X-Men. She is currently preparing to make her move and set Sinister's plan in motion.

Early life
Madelyne "Maddy" Jennifer Pryor is a clone created by Mr. Sinister with a lock of Jean's hair. A test-tube baby, she was fully grown in only a few short years. Sinister activated her when she was fully grown and trained her to infiltrate the X-Men. She greatly resents his control over her, but she literally cannot stop herself from obeying him.

The present
Madelyne is preparing to make her move and assume the identity of the currently-incapacitated Jean, and if all else fails, pose as Jean's long-lost twin. Her job is to gain the X-Men's trust as she pulls them apart, and she will not fail.