An original 4 part Doctor Who adventure starring Peter Davison, Colin Baker and Sylvester McCoy. Written and directed by Nicholas Briggs. The fifth, sixth and seventh doctors, together for the first time. Gallifrey is in a state of crisis, acing destruction at the hands of an overwhelming enemy. And the Doctor is involved, in three different incarnations - each caught up in a deadly adventure, scattered across time and space. The web of time is threatened - and someone wants the Doctor dead. The three incarnations of the Doctor must join together to set time back on the right track - but in doing so, will they unleash a still greater threat?

Firedrake, a young dragon, receives a frightening warning one night: Humans are planning to destroy the valley in which he lives! All the dragons must flee. Their only refuge is a place above the clouds called the Rim of Heaven --- which may not even exist. Firedrake boldly volunteers to go ahead first. As he embarks on his journey, he meets Ben, a runaway boy. Together, the boy & dragon make their way toward the Rim of Heaven, all the while running a step ahead of Nettlebrand, a monster who will stop at nothing to hunt down Firedrake. Their quest will truly become an adventure like no other.