Jimmy's Best Friend. Carl is allergic to lots of things, including cats, turtles and even lasers. Yet he still helps Jimmy with his experiments. In the movie, Carl wore suspenders but in the TV show he doesn't.
Carl often saves the day and utters occasional pearls of wisdom which belie his station as resident nebish: "The heart wants what the heart wants" "I can not be a genius 24/7!" and "I don't want to be cool." It is also said he has an sensitive scapula.
Carl is also a Sentinel cadet once alongwith the Ultima wielder and Jimmy to find the Chaos emerald.