In the Ultimate Marvel comics, Wanda is the daughter of the mutant super villain Magneto and originally put her powers to use helping the Brotherhood of Evil Mutants. Eventually Wanda realized her father could not live up to his own standards and quit the team, trying to make up for her time as his pawn. Wanda would join Charles Xavier's X-Men and later The Avengers. Wanda is a mutant witch he power to manipulate probability, however even she is not always fully in control of the out come of her powers. Wanda was trained by the witch Agatha Harkness in the art of Witchcraft as her developing powers were easily governed by the same disciplines. As a result of her training Wanda is not only a powerful mutant but also a practicing witch.
When Magneto was abducted by the alien known as The Stranger, The Brotherhood became effectively disbanded, leaving Wanda and Pietro on their own again. With no more reason to stay on their father's evil path the two took other paths. Wanda left with Namor the Sub-Mariner and joined the Avengers, Pietro went to work for The X-Men trying to make-up for his time with Magneto. Though heroism became an ill fit for Pietro Wanda felt right at home and frequently lent a hand to the X-Men as well.
As part of the Avengers, The Scarlet Witch has fought numerous evils, from aliens, to sorcerers to robots, to mutants. When Magneto eventually returned Wanda faced a conflicting wish to continue to be the good influence in her father's life but knew it would bring her into confrontations with her team-mates. Pietro joined Magneto on Wanda's behalf and Scarlet Witch remained a covert contact for the Brotherhood of Evil Mutants.
After the events of House of M, where Wanda created a tear in reality and saw her father was unwilling to live peacefully with humanity even after all his desires were handed to him, Wanda gave up on trying to pacify Magneto's hatred of humanity and restored reality, fully withdrawing from any loyalties she had to Magneto.
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