At the Iceworld Space Trading Colony on Svartos, the seventh Doctor (Sylvester McCoy) and Mel (Bonnie Langford) unexpectedly encounter an old ‘friend.’ The penniless and desperate Sabalom Glitz (Tony Selby) has only one option to leave Svartos: find the fabled ‘Dragonfire’ treasure concealed somewhere in the depths of the planet.

Joined by Ace (Sophie Aldred), a teenage waitress with a love for explosives, the group ventures off to uncover lost riches. Little did they know that Kane (Edward Peel), Iceworld’s ruthlessly intimidating overlord, has murder on the mind and will not hesitate to do away with them in order to gain possession of the Dragonfire. Before long the Doctor finds himself playing a deadly game of cat and mouse with Kane’s mercenaries, descending through the ice caverns ever closer towards the deadly gaze of the monstrous dragon that lurks below.