Battle For The Neverhood
Charles is one of the 8 chaos immune to Dr. Kogg's gas, and he and his immune friends to go save all the other infected chaos. Charles is the only one who can go into small holes that lead to bonuses. He can also use the cube bobble on his head to flatten enemies, push it to enemies, and trap foes.
Later, Charles helps Klaymen defeat both mutated Yoko and Nora at the Lurker Graveyard. He and his friends go to Kogg's Forteress to stop Dr. Kogg, and they all swim back to their island after the Forteress exploded.