Various Welsh legends come to life when three youngsters dive into coastal waters and discover a floating island that transports them to an ancient time of magic, evil curses and potent jealousies.
The direction of the live action bookends to this unimpressive but well-meaning piece of TV animation is unforgivably shoddy, with the links between the contemporary characters and their mythic counterparts tenuous, to say the least.
The cartoon tales themselves fare a little better, although, for the uninitiated, they form a confusing and rather rushed introduction to this particular folklore. It's not even as if the animation is of a sufficiently eye-catching style to merit a cinema release - when computer effects briefly enter the fray, the results are appalling. There's a place for it as a Friday afternoon treat during history lessons in Welsh schools, but that's as far as it goes.