Lavender Castle is a place of mystery and legend, fabled throughout the universe, a floating city of light, a place of peace, harmony and all the things that have ever been dreamt of. It is the centre of the universe and the greatest source of power - should it be destroyed, the universe would be plunged into darkness forever. Evil scientist Dr Agon plans to do just that. A lonely meglomaniac with technology-assisted powers of transmutation, he yearns for darkness and has pledged to destroy Lavender Castle from his fortress spaceship, the Dark Station, the most awesome destructive power in the universe, crewed by unseen slaves working deep in the bowels. In order to prevent this, Captain Thrice has set out on a quest to find the elusive Lavender Castle before Dr Agon. A previous encounter with Lavender Castle gave life to Thrice's walking stick and left the Captain with a special knowledge of its power and abilities.