Phineas and Ferb's Frighteningly Top-Secret Marathon was a marathon of Phineas and Ferb that aired on Toon Disney on Halloween, 2008. The episodes were pretty much all scary/monster/Halloweenish episodes. It aired as the final day of Toon Diseny's Howl & Shriek Movie Week which ended after this with the movie Alvin and the Chipmunks Meet Frankenstein.
- 2pm Eastern/1pm Central - "Are You My Mummy?/Flop Starz"
- 2:30pm Eastern/1:30pm Central - "Raging Bully/Lights, Candace, Action!"
- 3pm Eastern/2pm Central - "Get That Bigfoot Outa My Face!/Tree to Get Ready"
- 3:30pm Eastern/2:30pm Central - "It's About Time!, Parts 1 and 2"
- 4pm Eastern/3pm Central - "The Monster of Phineas-n-Ferbenstein/Oil on Candace"
- 4:30pm Eastern/3:30pm Central - "One Good Scare Ought to Do It!, Parts 1 and 2"