Credits
Appel worked on the listed shows and wrote all the listed episodes:
- The Simpsons (1994–1997) - writer, producer, co-executive producer, consulting producer and story editor
- "Mother Simpson"
- "Bart on the Road"
- "22 Short Films About Springfield" (co-writer)
- "Bart After Dark"
- "The Secret War of Lisa Simpson"
- "The Two Mrs. Nahasapeemapetilons"
- "When You Dish Upon a Star"
- King of the Hill (1997–2001) - executive producer
- A.U.S.A. (2003) - creator, executive producer, writer
- "Pilot"
- "12 Happy Grandmothers"
- The Bernie Mac Show (2003–2005) - co-executive producer, writer
- "Eye of the Tiger"
- "That Old Mac Magic"
- "Stiff Upper Lip"
- "Nerdy Mac"
- I ♥ Huckabees (2004) - Actor (as Josh)
- Kitchen Confidential (2005–2006) - co-executive producer, writer
- "Praise Be Praise"
- "Let's Do Brunch"
- My Ex Life (2006) - creator, executive producer, writer
- Family Guy (2008–2009) - co-executive producer, writer
- "Family Gay"
- American Dad! (2008–2009) - executive producer
- The Cleveland Show (2009-) - co-creator, executive producer, writer
- "Pilot"
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