The World Traders (audio story)

 was the first story in the tenth series of The Fourth Doctor Adventures, produced by Big Finish Productions. It was written by Guy Adams and featured Tom Baker as the Fourth Doctor and Louise Jameson as Leela.

It featured the Big Finish debut of the Usurians, who were introduced in The Sun Makers.

Publisher's summary
When a day out in 21st Century London leads to the TARDIS being impounded, the Doctor and Leela find themselves getting involved with the mysterious Amapan Investments, a company that’s managed to become remarkably successful in a remarkably short amount of time.

So what’s their secret? The Doctor and Leela are about to find out.

The Usurians have come to Earth. And they have big plans.

Part one
to be added

Part two
to be added

Part three
to be added

Part four
to be added

Cast

 * The Doctor - Tom Baker
 * Leela - Louise Jameson
 * Emma Fremantle - Sara Powell
 * Jeffery Secombe / Mozz Consolidated - Chris Porter
 * President Dunn-La - Ramon Tikaram
 * The Director - Siân Phillips

Worldbuilding
to be added

Continuity

 * UNIT is unavailable (TV: Resolution, Spyfall)
 * The Doctor and Leela have encountered the Usurians before on Pluto (TV: The Sun Makers)