The series is set in a world populate by anthropomorphic cats, and focuses on the four-cat team known as the Catstronauts, consisting of...
- Captain Meowser: The Leader.
- Pom Pom: Science Officer and only female.
- Blanket: Tech Expert.
- Waffles: The Big Eater.
They go into various missions in space, one in each book.
Catstronauts contains examples of:
- Alliterative Title:
- Book 1: Mission Moon
- Book 3: Space Station Situation
- Book 4: Robot Rescue
- Big Eater: Waffles.
- Black Bead Eyes: Most of the cast have these. Waffles' eyes, however, are solid white.
- The Bully: In "Race To Mars", Captain Meowser reveals that he spent some time as a cadet amongst the Cosmocats as part of an exchange program, and that, apparently, the Cosmocats were pretty mean to him back in the day. Of course, in actuality, Meowser was the bully, and quite hot-headed too. The Cosmocats were tough on him because they wanted him to improve.
- The Captain: Captain Meowser.
- Everyone Calls Him "Barkeep": The World's Greatest Scientist is only ever called "The World's Greatest Scientist".
- Fun with Acronyms:The Catstronauts work for a space program known as C.A.T.S.U.P.: Center for Aeronautical Technology and Space Underlying Programs. In "Race To Mars", we learn the names of three other space exploration organizations.
- S.O.C.K.: Society Of Cosmic Kittens.
- M.E.O.W. Modern Explorers of Other Worlds.
- C.O.O.K.I.E.: Center Of Obvious Knowledge and Interstellar Exploration.
- Gadgeteer Genius: Blanket. He built Cat-Stro-Bot.
- I Choose to Stay: Pom Pom decides to stay on Mars with the Cosmocats at the end of the second book.
- The Leader: Captain Meowser is the leader of the Catstronauts.
- Robot Buddy: Cat-Stro-Bot is this.
- Robot Me: In "Robot Rescue", the Catstronauts disguise four robots to look and act like them so no one at C.A.T.S.U.P. will know they've gone to Europa to retrieve Cat-Stro-Bot. It works well, up until they get wet.
- The Smurfette Principle:Pom Pom is the only female member of the Catstronauts.
- Tertiary Sexual Characteristics: All the female cats in the series have the fur on their head in the shape of a female hairdo.
- Tickertape Parade: The Catstronauts are given one at the end of the first book.
- World of Funny Animals: Catstronauts is populated entirely by anthropomorphic cats.