This episode begins with an alien landing on Earth to make first contact in the African desert.

Was there an alien landing on Earth?

And I think we used the analogy of an alien landing in New York and noticing that, when the rain came down, everyone opened their umbrellas.

There was an awful lot of the Master in that fragment; it had understood many things about the alien landing before anyone else.

"I remember going back to Harvard and feeling like being an alien landing on a primitive planet," he said.

The release of the files are likely to intensify the claims of conspiracy theorists who believe the US government covered up alien landings.

But since the alien landing, Tyrathect knew that he was something else: deathly afraid.

Roswell was a small town, and Bauman was the biggest local attraction since the 1947 crash and suspected alien landing.

Moreover, anticipating other alien landings which could take place anywhere, the United States offered to share its stock of atom bombs with any nation so invaded.

In no more than months every continent and nation on earth would be equipped to defy any alien landing that might take place.