- Illustrated Chapter Books
- Ages 7–10
- Comedy
Captain Underpants and the Big, Bad Battle of the Bionic Booger Boy, Part Two
Book 7 of 12 in Captain UnderpantsView the full series
The direct payoff to book 6, with Robo-Boogers threatening the world in maximum gross-out style. It is serial Captain Underpants at its most gleefully disgusting.
- 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
Experience meters
What’s it about?
The story.
Just when George and Harold think they have survived the Bionic Booger Boy, the Robo-Boogers arrive. These hi-tech blobs of gloopy snot are disgusting, dangerous and determined to cover the world in green sticky chaos. Captain Underpants has his waistband powers, but even he may need a hankie for this one. Part Two keeps the series in full gross-out mode, but it also works as a very accessible serial adventure: readers who finished book 6 have a clear reason to keep going. The plot is absurd, the jokes are proudly juvenile, and the science is nonsense in the best Captain Underpants tradition. For the target audience, the silliness is the point. The book is especially effective for children who like monsters, robots, bodily-function jokes and stories that never slow down.
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
- Snot jokes
- Robot monster silliness
- Comic prose hybrid
Avoid if
- Dislikes gross out jokes
- Dislikes toilet humour
- Has not read book six
- 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 satisfaction is the payoff — the cliffhanger from part one resolved, the monsters defeated, and a brand-new time-travel device introduced just in time to make the next book sound even more outrageous. The kind of ending a seven-year-old reads twice before putting the book down.
- Breaking the rules safely
- Trickery and cleverness
- Surviving danger
- Making a difference
- Friendship and belonging
Why parents love it
The closing half of the duology — and the moment Captain Underpants quietly upgrades from standalone gross-outs into a series with continuity. A reluctant reader who finishes this one almost always wants book eight. The two volumes together are the strongest single purchase in the run.
- 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.
More like this…
Books that share themes and topics with this one.
Buy or borrow
Pick up a copy.
- Bookshop.org ↗
- Waterstones ↗
- Amazon UK ↗
- Hive ↗
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