Back To Doof 101 is a 41st episode of season one of The All New Series of Phineas and Ferb.
Heinz Doofenshmirtz is punished by some community service for being evil to the new school, Danville High School on the first day of school. Meanwhile, Phineas and Ferb was building a playground for recess. This episode takes place in the episode and series Doof 101.
- Doof 101 Theme Song
I know we’re going to do today
Hey, Where’s Perry?
Oh, there you are, Perry
Perry’s entrance to lair
- This is the episode take place in the episode of Phineas and Ferb: School Dayz! and Doof 101.
- Linda, Lawrence, Buford, Baljeet, Isabella and Candace didn’t appear in this episode.
- This is the episode take place after The Final Day of Summer in the season five and series finale.
- This episode take place for the first day of school.
- SpongeBob SquarePants - This is the episode just like New Student Starfish.
- Vincent Martella as Phineas
- Thomas Sangster as Ferb
- Dee Bradley Baker as Perry
- Dan Povenmire as Dr. Doofenshmirtz
- Jeff Swampy Marsh as Major Monogram, Additional Voices
- Tyler Alexander Mann as Carl
- Caroline Rhea as Mrs. Willis
- Daran Norris as Principal Jorgan
- Alec Holden as Corey Marland
- Tom Kenny as Wesley Warren
- Dionne Quan as Abigail Lavenders
- Gary Cole as Principal Lang
- Olivia Olson as Vanessa
- Logan Miller as Johnny
- Danica McKellar as Becky
- Benita Scheckel as Lacey Milano, Sally Silverstein, Additional Voices
- Jason Dolley as Grant
- Josh Gad as Wendell
- Stephen Root as Floyd
- J.K. Simmons as Napoleon
- Lucas Grabeel as Ropey-Face