Renfield T. Rodent

Renfield first appeared on Angel Island, having invited Knuckles and the Knothole Freedom Fighters to the Happy Land Amusement Park which he operated. Renfield, with the aid of Dr. Ivo Robotnik, then trapped Sonic and the rest of the Knothole Freedom Fighters in a House of Mirrors (within the mirrors themselves). Instead of being trapped in the mirrors, Knuckles' chaos-based powers were robbed from him. Robotnik allowed Knuckles to leave, wanting him to feel totally helpless without his powers. Knuckles fled and later met up with the rest of the Chaotix, including Heavy and Bomb. Knuckles and the Chaotix liberated Sonic and the others, and making short work the repaired Metal Sonic robot. Robotnik ditched Renfield and allowed him to be captured by Knuckles while he escaped alone. Later on, Renfield reopened his amusement park to the public.

The Chaotix once again ran into Renfield when Charmy Bee's best friend, Mello, died of food poisoning from the theme park's "secret sauce" placed on the food, which was supposed to make those who ate it addicted and thus constantly returning to Happy Land. Downtown Ebony Hare found out about Renfield's plans and forced his way into controlling Renfield's business, just as the Chaotix and Knuckles had entered the amusement park. Ebony Hare was arrested but Renfield was allowed to operate his amusement park without the toxic secret sauce, which was confiscated by Constable Remington.

Renfield was not seen again until 3237. Rouge the Bat accompanied Knuckles and the Chaotix to Renfield's newly-opened Casinopolis in Station Square. It was revealed that Renfield was using the casino as a front for Dr. Eggman's newest Auto Automaton factory, which used scanners hidden in the slot machine screens to copy customers data and build up an army of infiltrators. Mighty the Armadillo and Julie-Su managed to slip out of Renfield's traps and destroyed the robot factory. Following his capture, Renfield was going to stand trial for his crimes at Station Square.