Glitz is hot on the trail of hidden treasure and the Doctor, keen to do some scientifi research, decides to join him. Down into the Ice Passages they go - through the Ice Garden, past the Singing Trees, beyond the Lake of Oblivion - in search of Dragon's Treasure.

But the Doctor and his companions don't know the true worth of this mythical horde. Only Kane, the most feared man in Iceworld knows the secret of the Dragonfire ...
 

When the Doctor and Mel arrive in the Space Trading Colony of Iceworld, the Doctor can feel there is mischief afoot. And he and Mel don't have to wait long before they discover the culprit, for there in the Refreshment Bar they met up with that old intergalactic rogue, Sabalom Glitz.

Down into the Ice Passages they go - through the Ice Garden, past the Singing Trees, beyond the Lake of Oblivion - in search of Dragon's Treasure.

But only Kane, the most feared man in Iceworld knows the secret of the Dragonfire ...
 
 

"They will have no past, no future, no will of their own. No purpose except to obey me. To them I shall be invincible, my power shall be absolute!"

Iceworld. An intergalactic trading post, ruled by the power-hungry Kane. Now his dream of total power is near to realisation with his aquisition of a band of mercenaries from the infamous Glitz in part payment for his debts. For "Cryosleep" will render the men utterly in his power. Meanwhile, Glitz still owes the balance of the debt and looks to Iceworld's mythical dragon and the Dragonfire - the treasure it reputably guards - to solve his problems at last.

Intrigued by the legend of the Dragonfire, the Doctor, Mel and young Earth girl, Ace, accompany Glitz - unaware that they are being followed by Kane's mercenaries. For the psychotic ruler believes that with the Dragonfire in his possession he can avenge the rulers of his home planet who banished his long-dead partner 3,000 years ago.

And so it seems that beneath Iceworld's superficial civility lies a froze core of corruption and the Doctor has embarked on something far more sinister than a mere treasure hunt...

Originally transmitted 23 November 1987 - 7 December 1987, this three part adventure introduces Ace as a future assistant for the Doctor and is the 150th episode of the programme..

Running time: 73 mins approx.

Produced by John Nathan-Turner
Directed by Chris Clough
Cover Illustration by Bruno Eletton