Phineas and Ferb backdrop

Phineas and Ferb S5E21 — Book Flub

8.3

Phineas and Ferb•Season 5•Episode 21

Book Flub

8.3/10 · 3 votesJul 19, 202511 min

Ranked #11 of 38 in Season 5•+0.4 vs season avg

Candace ignores her brothers for a day in order to help her Mom with a bust of her own.

Directed byAmber Tornquist Hollinger

Written byKim Roberson

Previous episodeE20 · Attack of the Candace Suit Next episodeE22 · The Bad Old Days

Seasons6

All 1 2 3 4 5 6

Season 5 Episodes38

Summer Block Buster still

Summer Block Buster

Cloudy with a Chance of Mom still

Cloudy with a Chance of Mom

Submarine Sandwich Submarine still

Submarine Sandwich Submarine

License to Bust still

License to Bust

Dry Another Day still

Dry Another Day

Deconstructing Doof still

Deconstructing Doof

Tropey McTropeFace still

Tropey McTropeFace

Biblio-Blast! still

Biblio-Blast!

A Chip to the Vet still

A Chip to the Vet

More Than an Intern still

More Than an Intern

The Aurora Perry-Alis still

The Aurora Perry-Alis

Lord of the Firesides still

Lord of the Firesides

The Candace Suit still

The Candace Suit

Agent T (for Teen) still

Agent T (for Teen)

The Haberdasher still

The Haberdasher

Out of Character still

Out of Character

The Chronicles of Meap Ep. 42 Meap Me in St. Louis still

The Chronicles of Meap Ep. 42 Meap Me in St. Louis

No Slumber Party still

No Slumber Party

The Ballad of Bubba Doof still

The Ballad of Bubba Doof

Attack of the Candace Suit still

Attack of the Candace Suit

Book Flub still

E21 8.3Now viewing

Book Flub

The Bad Old Days still

The Bad Old Days

Mantis Fact! still

Mantis Fact!

The Nightmare-Inator still

The Nightmare-Inator

Doof in Retrograde still

Doof in Retrograde

Bend It Like Doof still

Bend It Like Doof

Dooflicated still

Dooflicated

Space Adventure still

Space Adventure

Droogenfest still

Droogenfest

Doofercise still

Doofercise

Croquet Y-8 still

Croquet Y-8

Dinner Reservations still

Dinner Reservations

Bread Bowl Hot Tub still

Bread Bowl Hot Tub

Entrance Exam still

Entrance Exam

Dungeons & Dating still

Dungeons & Dating

Elevator Irritator still

Elevator Irritator

Master of Fate still

Master of Fate

VENDPOCALYPSE: THE MUSICAL still

VENDPOCALYPSE: THE MUSICAL

Cast8

Vincent Martella

Vincent Martella

Phineas Flynn (voice)

David Errigo Jr.

David Errigo Jr.

Ferb Fletcher (voice)

Ashley French

Ashley French

Candace Flynn (voice)

Caroline Rhea

Caroline Rhea

Linda Flynn-Fletcher (voice)

Dee Bradley Baker

Dee Bradley Baker

Perry the Platypus (voice)

Alyson Stoner

Alyson Stoner

Isabella Garcia-Shapiro (voice)

Dan Povenmire

Dan Povenmire

Dr. Heinz Doofenshmirtz (voice)

Jeff 'Swampy' Marsh

Jeff 'Swampy' Marsh

Major Francis Monogram (voice)

Crew4

Kim Roberson

Kim Roberson

Writer

Derek Lee Thompson

Derek Lee Thompson

Storyboard Artist

P

Patradol "Dodo" Kitcharoen

Storyboard Artist

A

Amber Tornquist Hollinger

Director

Discussion

0 comments

Join the conversation

Share your take and reply to other fans.

No comments yet

Be the first to share your thoughts on this episode.

Episode Summary

"Book Flub" is episode 21 of Phineas and Ferb season 5. It scored 8.3/10 from 3 votes, ranking #11 of 38 episodes this season (season average 7.9). Directed by Amber Tornquist Hollinger and written by Kim Roberson, it aired on July 19, 2025.

Next: E22 · The Bad Old Days Best of Season 5