Copycat is an incredible metamorph, able to duplicate another person so accurately that even those closest to them can't tell the difference. Her ability may even allow her to replicate her template's psi-patterns.

Using her shape shifting powers, Copycat was able to hide incognito amongst the humans who had hoped to flee North America and was able to discover the site of the Sentinel Evacuation while in their midst. Vanessa led the Brotherhood to emigration site in Maine and there they clashed with the Amazing X-Men. In an attempt to elude the X-Man Quicksilver, Copycat posed as Scarlet Witch, but was forced to revert to her normal self by Dazzler. Both Copycat and Box were able to escape the X-Men and conceal themselves, posing as humans, and escaped to Europe. They were discovered at a checkpoint and provided a distraction for a group of Altered Humans to pass through, but were subsequently hunted down by Weapon X and Jean Grey with the latter slaying Vanessa in the process.