filburt turtle is rocko's other best friend, a neurotic, hypochondriac turtle who speaks in a woody allen-like voice. he started out as a different character, usually seen having many jobs, such as a supermarket cashier and a clerk at the department of motor vehicles, before being written in the storyline as rocko and heffer's friend in the second season. he lives in a trailer and earns his money by collecting cans "here and there", and has a penchant for "sauce". filburt has an extremely weak stomach and even the slightest wrong movements can give him nausea. he tried to be a dentist but failed in his last exam when he turned one of rocko's teeth into a giant mutant tooth. he turned 21 in the second-season episode "born to spawn" where he is called to his home island of kerplopitgoes in order to become an adult. at one point, he also had a frank sinatra style singing voice that he nearly became a star with. he eventually started a family with dr. hutchison, a bubbly cat with a hook for a hand. one of their children turned out to bear a strong resemblance to heffer, thanks to his having sat on their egg during the incubation period. among filburt's catchphrases are "oh fish sticks!", "oh boy." and, "i'm nauseous... i'm nauseous.", and "turn the page, wash your hands. turn the page, wash your hands. and then you turn the page, and then you wash your hands..."