The Stageplays: Seven Keys to Doomsday

In 2008, The Stageplays: Seven Keys to Doomsday was released by Big Finish Productions.

Cover blurb
A special audio adaptation of the Doctor Who stage-play from the 1970s.

A newly regenerated Doctor takes his young companions, Jenny and Jimmy, to the desolate world of Karn. There they must face terrifying monsters, and brave fiendish traps to locate seven crystal keys.

If they fail in their task, the Doctor’s arch enemies, the Daleks, will unleash their evil upon the entire Universe!