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Cats vs. Robots Books in Order

Part ofMargaret Stohl Books in Order

See the Cats vs. Robots books by Margaret Stohl and Lewis Peterson in order, with summaries, series background, and easy reading-order help.

Last updated: June 10, 2026

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2 books

1

This is War

by Margaret Stohl

2018

An intergalactic war between cats and robots crashes onto Earth, right into the lives of twins Max and Min Wengrod. Secret agents, battle bots, and one priceless chip force the siblings to work together fast.

2

Now with Fleas!

by Margaret Stohl

2019

The cats and robots are back, and this time the fight is over the Infinity Engine. Max, Min, and the whole Wengrod family unleash robotic fleas and wild science in a desperate bid to stop a planetary war.

Series background & context

Cats vs. Robots is exactly what the title promises, and also a little more. On the surface, it is a funny middle grade science fiction series about an intergalactic feud between the Feline Empire and the Robot Federation. Both sides want a powerful invention hidden on Earth, and both are willing to send agents, spies, and plenty of chaos to get it. That alone is enough to power the story. But the books also fold in sibling conflict, STEM ideas, family teamwork, and a surprisingly warm message about cooperation.

The human center of the series is Max and Min Wengrod, twins who could not be more different. Max loves games, cats, and improvising his way through trouble. Min is focused, competitive, and very much on the robot side of the emotional equation. Their parents are scientists, which means the family home is already a magnet for strange technology before alien cats and robots start crashing into their lives.

That setup lets the series move in two directions at once. There is the big silly plot, secret cat operatives, robot overlords, battle bots, advanced chips, and later an army of robotic fleas. Then there is the smaller, grounded story of siblings learning to work together and a family realizing that the inventions they build can pull them into consequences they never expected.

The tone is playful on purpose.

This is War introduces the larger conflict and the race for the Singularity Chip. Now with Fleas! raises the stakes with the Infinity Engine, an even bigger threat, and more full-on intergalactic mayhem. Through all of it, the books keep a pace that works well for younger readers who like fast chapters, jokes, action, and lots of visual energy.

If you are wondering what kind of reading experience to expect, think comic middle grade adventure in prose form. The humor is broad, the science is friendly rather than heavy, and the illustrations add to the sense of movement and mischief. Cat lovers, robot lovers, and readers who enjoy big goofy stakes will all find something here. Underneath the chaos, the series is also quietly arguing for empathy. The cats and robots may be at war, but the books keep asking whether old rivalries are really worth preserving once everybody involved has to share the same planet.

Edited by

Richard Reis

Software engineer whose passion for tracking book recommendations from podcasts inspired the creation of MRB.

Anurag Ramdasan

Lead investor at 3one4 Capital whose startup expertise and love for books helped shaped MRB and its growth.

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All 2 Cats vs. Robots Books in Order (Complete List 2026)