I Know What We're Gonna Do Today Marathon was a marathon aired on Disney XD on April 26, 2009 from 7:00 pm to 12:00 am EST.
Schedule[]
- 7:00 pm - "Put That Putter Away"/"Does This Duckbill Make Me Look Fat?"
- 7:30 pm - "Out to Launch"
- 8:00 pm - "Interview With a Platypus"/"Tip of the Day"
- 8:30 pm - "Attack of the 50 Foot Sister"/"Backyard Aquarium"
- 9:00 pm - "Perry Lays an Egg"/"Gaming the System"
- 9:30 pm - "The Chronicles of Meap"
- 10:00 pm - "Don't Even Blink"/"Chez Platypus"
- 10:30 pm - "Phineas and Ferb Get Busted!"
- 11:00 pm - "Run Away Runway"/"I Scream, You Scream"
- 11:30 pm - "Greece Lightning"/"Leave the Busting to Us!"