A young boy who has no identity nor memory of his past washes ashore on the coast of Wales and finds his true name after a series of fantastic adventures.

In order to stop Rhita Gawr from destroying Avalon, Merlin's grandson, Tamwyn, and his friends, Elli and Scree, engage in battles with the warlord and his army of warriors underground, on Earth, and in the sky.

Having stumbled upon his hidden powers, the young wizard Merlin voyages to the Otherworld in his quest to find himself and the way to the realm of the spirit.

Having stumbled upon his hidden powers, the young wizard Merlin voyages to the Otherworld in his quest to find himself and the way to the realm of the spirit.