- Illustrated Chapter Books
- Ages 7–10
- Comedy
Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy, Part One
Book 6 of 12 in Captain UnderpantsView the full series
A two-part gross-out escalation where Melvin Sneedly's invention creates the Bionic Booger Boy. It is peak Captain Underpants: snot jokes, school chaos, fast chapters and relentlessly child-facing comic energy.
- Best for7–10
- FormatIllustrated
- Length176 pp
- Read aloud~2 hr30 min
The vibe
What it’s like.
Style
- Conversational
- Comedic
- Onomatopoeic
Tone
- Funny
- Silly
- Irreverent
- Absurdist
- Exciting
Themes
- Consequences of actions
- Friendship
- Creativity and imagination
- Responsibility
- Teamwork
- Power and authority
Experience meters
What’s it about?
The story.
George and Harold are back in another magnificently icky school disaster. This time, class brainbox Melvin Sneedly goes too far with an invention, and the result is the Bionic Booger Boy: a sticky, snotty, bad-tempered monster who is every bit as disgusting as the title promises. The sixth Captain Underpants book begins a two-part story, so it has a slightly more serial feel than the earlier standalones. Dav Pilkey still packs the pages with cartoons, Flip-O-Rama, fake comics, absurd science and full-force toilet humour, but the plot also leans into consequences: George, Harold and Melvin all have to deal with a joke-idea becoming real. It is not subtle, but it is exactly the kind of book that can make reluctant readers feel that reading is finally built for them.
Fit check
Right for your child?
Where it lands by age
- 1
- 3
- 5
- 7
- 9
- 11
- 13
- Best fit · 7–10
- Read aloud · 6–10
- Independent · 7–10
Prose load
Moderate
Visual support
High
Reluctant-reader friendly
Very
Read-aloud quality
Strong
Works well for
- Reading aloud
- Reading together
- Gift-buying
- Reluctant readers
Nothing in the book is likely to concern most parents. Safe to recommend without preview.
Bedtime suitability
2 / 5 · Better outside bedtime
Sensitive-child
4 / 5 · Good fit
Graphic intensity
1 / 5 · None
Best for
- Reluctant reader pick
- Gross out humour
- School comedy
- Snot jokes
- Comic prose hybrid
Avoid if
- Dislikes gross out jokes
- Dislikes toilet humour
- Prefers gentle books
- Wants realistic school story
Particularly good for children who are…
- Reluctant reader
- Struggling with reading
- Neurodiversity or learning differences
In the classroom
How it works in school.
The anarchic, wildly funny Captain Underpants series — a legendary reluctant-reader hook and classroom-library staple.
A book children love that happens to support school — never a stand-in for the texts a class is taught with. Reviewed for the classroom · June 2026.
Why it lands
Why they love it.
Why kids love it
The specific kick is the cliffhanger — most series books end, this one stops mid-disaster, and a seven-year-old who never finishes books finds themselves at the back cover refusing to put it down until they get part two. The gross-out scale is also at its peak: even by Captain Underpants standards, this one delivers.
- Breaking the rules safely
- Trickery and cleverness
- Revenge on adults
- Surviving danger
- Friendship and belonging
Why parents love it
Buy this one and part two together. The booger duology is the point in the Captain Underpants series where Pilkey trusted the audience to finish a two-book arc — and the reluctant readers it was written for almost always do. The book that doubles a child's reading mileage in a week.
- Shared humour
- Quick to read
- Nostalgia
In the series
Captain Underpants.
12 books · open the series →
About the author & illustrator
Dav Pilkey.
If you liked this
Three ways out of this book.
If you liked this, try…
Lateral matches. Same shelf, different texture.
Come into this from…
Easier or preparing reads — perfect lead-ins.
Where to go next…
Escalation reads — a step up in scale, silliness, or stakes.
Buy or borrow
Pick up a copy.
- Bookshop.org ↗
- Waterstones ↗
- Amazon UK ↗
- Hive ↗
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