19. The Transformers (1984–1987) 18. He-Man and the Masters of the Universe (1983–1985) 17. Thundercats (1985–1989) 16. Avatar: The Last Airbender (2005-2008) 15.The Smurfs (1981–1990) 14. Batman: The Animated Series (1992–1995) 13. Yogi Bear (1958–1988) 12. Scooby-Doo, Where Are You! (1969–1972) 11. SpongeBob SquarePants (1999- ...) 10. Beavis and Butt-head (1993–1997) 9. Animaniacs (1993–1998) 8. Futurama (1999–2003; 2008– ...) 7. South Park (1997- ...) 6. The Rocky and Bullwinkle Show (1959–1973) 5. The Flintstones (1960–1966) 4. Tom and Jerry (1940-1958) 3. King of the Hill (1997–2009) 2. The Simpsons (1989– ...) 1. Looney Tunes (1930-1969)