|The Invisible Castle (Tempo Books)|
|Published by||Tempo Books Ltd.|
|Story by|| Adapted from screenplay|
by Peter Lawrence
|Illustrated by||Colin Petty|
The Invisible Castle was an illustrated softcover ThunderCats storybook that was published by Temopo Books in 1987. It was audiobook and came with an accompanying audio cassette which narrated the story of the book. This book is a retelling of the ThunderCats episode The Astral Prison.