The alien world of Marinus. Perfect peace has reigned here for decades due to the mind-controlling influence of a machine known as the Conscience. But now a race known as the Voord have developed an immunity and Arbitan, keeper of the machine, has be... (more)en forced to scatter the vital control keys around the planet. Now he needs the help of the time travellers to get them back - it will be an extraordinary journey, with perils every step of the way...

Alan James, Donald Pickering, Fiona Walker, Henley Thomas, Katherine Schofield, Martin Cort, Michael Allaby, Peter Stenson, Raf de la Torre, Robin Phillips