Trapped underground, the Doctor and Mrs Wibbsey encounter a small boy who claims to be Aladdin, in search of a fabled lamp. He joins them on their own quest, to find a power source in this weird domain and switch it off. Many obstacles lie in their way. Vast rooms stuffed with exotic items give way to torch-lit tunnels and deadly precipices. Creatures of mythical proportions lie in wait. Peculiar atmospheres take their toll on them. Perhaps strangest of all, the Doctor’s multi-coloured scarf appears to take on a life of its own…