The Neutron Knights were led by Catavolcus and invaded Earth during the Millennium Wars, a new dimension created by Melanicus when he took control of the Event Synthesizer. They invaded a castle defended by King Arthur and Merlin the Wise. (COMIC: The Neutron Knights)
Catavolcus and a Neutron Knight once attended Bonjaxx's birthday party on Maruthea. (COMIC: Party Animals)