Mr. Bass's Planetoid is a 1958 children's science fiction novel by Canadian author Eleanor Cameron.

[2] The boys hunt for Prewytt Brumblydge, inventor of the Brumblitron, which is threatening to explode, destroying the Earth.

This time, instead of journeying to Basidium, they fly to an airless rock named Lepton that orbits 1,000 miles above the Earth's surface.

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