Cloudy has been a part of the royal guard, the HeartFull Helper force, for about a year in order to use his lightning magic for good. He works hard to help Team 1 protect everyone in Shining Heart from munsnets and, more importantly, keep watch over the museum housing the famed Crystal Heart, a large heart-shaped crystal trapping decades worth of dark magic.
However, following a distress call coming from inside the museum, Team 1 are met with a new kind of threat, a large, cyborg hamster who calls himself Hypno leading a group of outsiders. While they attempt to distract Team 1, Cloudy enters the museum, correctly assuming that someone might still be inside. The intruder attempts to attack Cloudy and defends himself by shooting lightning towards them. Unfortunately, he misses, and ends up hitting the Crystal Heart, splitting it in two and releasing the magic trapped inside. The outsiders flee the scene, and the intruder escapes with one half of the crystal.
Team 1 must now scour Rodentia to find them, with Team 2's help. Wish them luck, and pray that they won't accidentally kill each other.