While returning to their dimension, Belasco grabbed Illyana and Kitty held her arm.Kitty lost her grip for a few seconds and reached back in the portal, until she felt an arm and pulled out Illyana.The X-Men encountered the underground community of mutants known as the Morlocks, who had kidnapped one of their former members, Angel.After Piotr's life was in danger, Kitty promised Caliban of the Morlocks her hand in marriage, while deathly sick from Plague, in exchange for aid in saving Peter and the X-Men's life, but Sprite did not keep her promise and returned to the X-Men.This time, he would only train them in the use of their special powers, and not send them out into combat.Xavier infuriated Kitty by terminating her X-Men status and moving her to the New Mutants, who she called the "X-Babies".
Afterwards, Kitty's father was furious at Xavier for the danger he believed he had placed his daughter in. Kitty quickly developed a crush on Colossus, but was uncomfortable around the demon-like Nightcrawler.
Emma Frost telepathically influenced Kitty's parents into transferring her to her Massachusetts Academy. After Kitty and Ororo (in Emma’s body) freed the X-Men, Kitty returned to Xavier's.
Illyana Rasputin, Colossus' six year old sister, was kidnapped by Belasco and the X-Men followed to Limbo, where Kitty was harassed by an alternate version of Nightcrawler, and they rescued her.
Due to her captivity in Limbo, where she spent years while only mere moments elapsed on Earth, Illyana returned to them thirteen.
Kitty and Illyana became very close and seemed to share a link, with Illyana even joining Kitty in Stevie's dance studio and becoming roommates.