Cousins William, Mary, and Alice stay at their uncle's old house, Golden House, and discover a hidden room where they meet Stephen Tyler, a 16th-century magician who has travelled through time. They must help him protect the valley from his wicked apprentice, Matthew Morden, who seeks to disrupt the magical and ecological balance.

• Katie Stuart
• Olivia Coles
• Steven Webb
• Ian Richardson
• Christopher Redman
• Neil Pearson
• Siân Phillips
• Jennifer Saunders