Jimmy Crikey is the orphaned alien who chose to make Earth his home. Earth is invaded by a species of omnivorous worm, the like of which no one has encountered before.
The four guardian witches of Earth's realms are powerless against the alien organism. It falls to Jimmy to seek the help of his technologically advanced friends on Attalia, his home planet in a different dimension.
Jimmy may be an orphan, but he has friends on both sides of the universe. Jade, the apprentice witch, joins Jimmy on his quest by becoming a stow-away on Jimmy's starship but unfortunately, they are attacked en route, in another region of space, by more wormz. In a touch-and-go drama they are rescued and recovered to the safety of Attalia where President Alpha calls upon his scientists to formulate a solution to solve the threat not only to Earth and its inhabitants but to any civilisation in any part of the universe.
They do arrive at a plausible counterattack strategy, and it is in Jimmy's hands to deliver salvation, or die in the attempt.