Season 36 – Production code 23DWA178
Written by J. W. Smith
In pursuit of past-times, the Doctor and Robbie visit Planet Earth in the year 2900. It is a golden age for humanity and home to one of the wonders of the Milky Way galaxy: The Sanctuary.
An orbiting shelter-of-last-resort, the Sanctuary was built to preserve the many extra-terrestrial animal species of the Milky Way, whose home planets are dead or dying. The monumental project represents the single most massive conservation effort in the history of mankind.
But all has not gone to plan…
The Doctor and Robbie arrive to discover that humanity, with the best of intentions, has nevertheless placed itself on the brink of self-destruction.
The two adventurers set forth upon a course that will take them backward in time and halfway across the galaxy in search of Planet Earth’s salvation…
Running time 144 minutes