Three become five as two new Centurions-John Thunder and Rex Charger- join the fight against the malevolent Doc Terror and his mechanoid minions. It's a much-needed boost too, as Crystal Kane and her original three Centurions Max Ray, Jack Rockwell and Ace McCloud- find their respective mastery of land, sea and air stretched to the limit as they face off against menaces monstrous, magical, mutant and mechanical. John Thunder's covert infiltration skills and Rex Charger's energy manipulation abilities are just the X-treme boost the Centurions need as Doc Terror allies himself with the alien cybernetic creatures Gog and Magog. And that's just a warm-up to cyberpunk mysteries, reality vortexes and oceanic black holes! But whatever the challenge, they are ready- the Centurions!