Card Passer is a former high-ranking G.U.N. commander who led an unauthorized attack on Dr. Eggman, but only to be stripped of his rank by the President for acting without unauthorization and fired from his position. As a result, Passer joined the S.O.N.I.C.X. organization to get revenge on Sonic the Hedgehog for making him lose his job. (SX: #23)

History

Card Passer and the members of S.O.N.I.C.X. were able to capture Sonic, and voiced his and the organization's reasons against Sonic. However, Sonic mocks the group's name, believing it to be a fan club, in which Passer and the others gave heated looks on Jerome Wise, who thought up their expanded name. Unfortunately for Passer and S.O.N.I.C.X., Sonic easily managed to escape from them. (SX: #23)

Much later, Passer and S.O.N.I.C.X. concocted their next attack on Sonic by tarnishing his name by creating an army of Sonic clones; but the clones are accidentally made with different colors, leading the public into believing they are related to the original, although not the original himself. Because of that, Passer is the first to scold Dr. Kai Narasu, the creator of the clones, for his mistake, but after their leader, the Organizer shows them a news broadcast where Sonic challenges the clones to a duel, Passer's overconfidence got the best of him as he decides to see the plan to the end. However, the clones were eventually destroyed by Dr. Eggman. Passer was then tricked into destroying the final clone by Sonic after seeing the clone's shadow among the smoke, making him think that it is the real Sonic and have it shot. (SX: #37)