1) Scrappy-Doo and Flim-Flam (tie, Scooby-Doo series)
It was 1979 and the ABC Network had a syringe to Scooby-Doo's neck: The show's ratings were plummeting, prompting Hanna-Barbera to whip up something on the spot or its mystery-solving hound would be put down for good. Scrappy-Doo was born from this near-disaster, balancing out the ratings before viewers realized what he was: A temporary life-preserver. Years later, instead of salvaging its dignity, Hanna-Barbera threw more gasoline—nay, the entire can onto the fire with Flim-Flam. Introduced in 1985's The 13 Ghosts of Scooby-Doo, Flim-Flam showed that some choose not to learn from their mistakes.