|Edition: || US (VHS)|
|Released: ||June 2002|
|Publisher: ||BBC Video|
|Format: ||1 x VHS NTSC|
In an attempt to return Tegan to Heathrow Airport, the TARDIS materializes on an alien spacecraft, which appears to have been abandoned just four days before reaching its final destination — Earth.
The Doctor and his companions soon discover that the ship isn't as empty as it first appears. Onboard they find Chinese, Mayan, Greek and Aboriginal passengers — and the froglike Urbankans. The Urbankan leader, Monarch, cordially invites the Doctor, Tegan, Nyssa and Adric to continue their trip to Earth as his guests.
Monarch has returned to Earth every few thousand years throughout history, but now he and the Urbankans plan to stay for good and to colonize Earth.
The more the Doctor learns of Monarch's grand scheme, the more anxious Tegan and Nyssa become for the future of mankind. But Adric thinks his friends have got the Urbankans all wrong. Who is the Doctor to trust?
Originally transmitted January 18 - 26, 1982.