Rulebook (audio story)

 was the tenth story of the sixth season of Big Finish Productions' Short Trips series.

Publisher's summary
The Ellani of Beadledom 3 lived their lives in regulated harmony until they were invaded by the Valtor. Of course the Doctor and his new companion Peri were delighted to help out, but they didn't know their biggest challenge wouldn't be the Valtor army, but the Rulebook...

Characters

 * Fifth Doctor
 * Peri Brown

Continuity

 * Peri is the Doctor's new companion. (TV: Planet of Fire)