Rabid Jack has been mentioned by numerous characters. He seems to be in control of Mi-Gor and Captain Donnie, who have respectively laid siege to Harmony Island and Braindeath Island, as well as Mechanical Murphy. His goal remains unclear, but he is probably trying to take over the South-eastern Sea for the second time, and gain vengeance. With the zombies, however, this proves hard to achieve. Therefore, he tries to make the zombie brains "un-rot", by swapping them with human brains. This attempt at brain-swapping was not successful, as depicted in The Great Brain Robbery quest.