Harrison takes all of the clichés of space opera - square-jawed heroes, sexy, empty-headed females, spaceships, ray guns, and Ultimate Weapons - and sends them up in this affectionate parody. Taking its cue from E.E. "Doc" Smith's Skylark series, the two young backyard scientists invent the Cheddite Projector, which makes instantaneous travel possible. They fit it into the Pleasantville Eagle, their football team airplane, and set off for the stars.

The plot basically centres around the war between the hideous Garnishee and the humanoid Lortonoi. The humans come into possession of an Ultimate Weapon - Krakar - and must decide which race to side with. The book gently attacks the most common clichés in science fiction, challenging their validity.

Harrison: "I enjoyed writing that book, but some fans thought it insulting: 'Hey, you're making fun of Doc Smith.' He was an old friend of mine, and if he was alive I'm sure he'd enjoy it. If I'm making fun of anybody, it's the hacks that are trying to redo space opera now."

Note: This book was adapted for radio by the BBC.