Chapter 1: Tiny, Purple, and Trouble

When Kate goes out on what's supposed to be a fun ninja-fighting mission with Wolverine, the whole thing goes a little sideways when she ends up instead being somehow transformed into her four-year-old self.

The X-Men are used to taking care of kids... but they're not used to taking care of a tiny Katie terror, and they're going to need all the backup they can get on this one.