Endowed with a bright red mop of unruly hair, big blue eyes, a small snub nose, pointed ears and enormous feet, the neighbourhood children ridiculed Jimmy, and he decided to run away to find a place where he fit in. He stumbled into an underground world in his midnight flight through the forest. He discovers and rescues the town of Roombelow from the curse of the sleeping spell cast by Matilda the Witch and is ‘adopted’ by Mr McDonald, the Mayor. Matilda and Gemma, the little lady who lives at the bottom of the well, but doesn’t know how she got there, become Jimmy’s close friends.

When rain threatens a flood, with the help of The Great White Owl, Jimmy locates the sleeping Weather Man, who turns off the rain.

When the well dries up, Jimmy and Gemma search beneath Roombelow. A giant eel has plugged the water flow from the spring that fills the well. They return Olsen to the sea.

Jimmy visits Aunt Ethel to let her know that he is well. She explains that Jimmy is an orphan from the starworld of Attalia, and hidden in the forest is a starship which could take him home. Jimmy chooses to return to Roombelow.

One-eyed trolls threaten Roombelow, and Jimmy outwits Erg, their chief. His return to Roombelow is delayed by a cry for help from the cliff-side world of Lithania. Little people inhabit it, the Diamonites, who look just like Gemma.

Jimmy returns to introduce Gemma to her lost family. Lithania relies on a supply of goods from The Traders, but two are stealing diamonites. Jimmy seeks justice, but Gemma is kidnapped by the thieves who intend to sell her as a curiosity in their land across the ocean.

Jimmy seeks the help of Witch Ira, the Queen of water sprites when he sets sail in pursuit. He discovers where Gemma is imprisoned and rescues her, but a mighty storm threatens their escape – Ira’s magic helps again. Then, with the aid of a pod of dolphins, they safely reach home.

Jimmy decides it is time to visit his birthplace - star world Attalia. The hidden starship is reactivated and heads homeward through the stars.

The ship is damaged during a skirmish with Kursh, the head of the planet Ock. Jimmy abandons the starship, ejecting in a life support capsule.

The Attalian Rescue Mission saves Jimmy, and its Commander, Zaru, befriends him. On Attalia, Jimmy is welcomed by President Alpha, who awards him the honorary rank of Commander. There are no surviving members of Jimmy’s family.

Tension builds as they face an attack from Ock, and interplanetary warfare follows. They repel the invaders, but Kursh plans to rule over Attalia.

Jimmy devises a plan to close the time warp linking Attalia to Ock. The destruction of the warp maroons Kursh in nether space. Once continued peace is assured, Jimmy returns to his family of friends in Roombelow.