Prewytt Brumblydge, inventor of the Brumblitron, must be found in order to disable the device before it destroys the Earth. This is a job for Mr. Bass, but he has disappeared...so the boys pore over his notebook for clues and go spacefaring to find him. This third Mushroom Planet adventure is illustrated by Louis Darling, illustrator of the Henry and Ramona series.
Original title: Mr. Bass's Planetoid
Genre: Fiction→ Children & Young Adult→ Science Fiction→ Inventions
Fiction→ Children & Young Adult→ Science Fiction→ Outer Space