The UCWF was an official wrestling franchise designed to accomodate sportsmen who possessed some level of superhuman strength and durability. It frequently employed survivors of the Power Broker process, and also maintained a female subsidiary for a time with the Grapplers.
Other members unrelated to the X-Men include Ben Grimm, Armadillo, D-Man, Beyonder, Ikaris, Cataphrax, Enigmo, and Sharon Ventura.