When fun-loving American agents Jeff and Jane Blue are called back from maternity leave for a special assignment in New Orleans, the spy parents decide to skip the sitter and give their bouncing baby girl the adventure of a lifetime.

Before Charles Xavier and Erik Lensherr took the names Professor X and Magneto, they were two young men discovering their powers for the first time. Before they were arch-enemies, they were closest of friends, working together with other mutants (some familiar, some new), to stop the greatest threat the world has ever known.