While investigating a strange energy in Carbury, the Tenth Doctor and Donna Noble are pulled into a different dimension, smashing a giant hole into another world in the process. As the magic of the hidden dimension slowly seeps out, the Doctor and Donna find themselves in Camelot, where a young squire, Arthur, comes to their aid, and when the Doctor is mistaken for Merlin, they are swept up in the glamorous and daring legends of the Knights of the Round Table. But something far more menacing has been awakened.

The TARDIS materialises on a research station, locked in a state of temporal displacement on the surface of Volkoff Epsilon. The station’s human crew are engaged in the study of a mysterious artefact they call ‘the remnant’. Apparently a source of unlimited power, it could be the solution to Earth’s energy problem. Yet the station’s time barrier has become disrupted, leaving the crew confined with no way out. The Doctor realises that both he and Ace - and the TARDIS - are now also trapped by the time displacement.

Why is the Doctor suddenly summoned to the shores of Loch Ness? Terror and panic spread as the third oil rig is smashed into the sea by a mysterious force...the monster? The controlling power must be the Zygons - alien creatures who have hidden on Earth for thousands of years, and who now feel strong enough to take over the planet. The Doctor, Sarah, Harry and UNIT have different ideas - but can they outwit the supreme cunning of the ruthless Zygons?

Some art can be deadly . . . Young Frida Kahlo is angry. Injured in a terrible accident, she lives with constant pain and worries that her dreams are unreachable. But when the TARDIS lands in Mexico City – drawn by a strange disturbance in its energy fields – Frida’s life is turned upside down. Aliens have arrived, taking over the bodies of children and killing anyone who gets in their way.

Tom Baker stars as the Fourth Doctor in 15 full-cast audio dramas written by Paul Magrs. Also included in this edition are a previously unheard interview with Tom Baker, outtakes from the original studio sessions, promotional trailers and a PDF booklet featuring sleeve notes by writer Paul Magrs.