Wolverine must overcome his feelings for Jean, and Storm must overcome her crippling claustrophobia, when the team journeys into the sewer to rescue Jean Grey & Cyclops from a race of hideously deformed mutants known as Morlocks, and their leader Callisto, who wants to make Scott her king.

Jubilee's first Christmas with the X-Men doesn't go exactly as she expected, when she, Storm, and Wolverine become involved with a mission to save the Morlock child known as Leech.