Max Rocker is a mutant who met Alexander Flynn and Hugo Longride. Max met Dazzler and drugged her, causing her to lose control of her powers. This gave Rocker and Flynn, using his powers of hypnosis, to convince Dazzler to remain with the Gladiators rather than leave with Beast.
In truth, Flynn planned on invading Latveria, and after capturing Beast and Dazzler, Flynn, Rocker, and other Gladiators taunted the two about their plans. Dazzler tried to convince Max to stop Flynn, but he could not do anything then. Flynn wanted the create an army of mutant warriors through survival of the fittest. Rocker felt this was a bit too much like Hitler's idea of a master race and tried to get fellow Gladiator Ivich to oppose Flynn with him. Max then released Beast and Dazzler, and got the assistance of the Heartbreak Hotel mutants Poltergeist and Link. After defeating Flynn, Rocker wanted to continue the Gladiators without death matches and was joined by Ivich and the other Gladiators.
Beauty and the Beast 1-4
New Mutants #29-31