Doctor Who and the Daleks in Seven Keys to Doomsday (stage play)

 was a stage play that originally ran in the period of transition between Jon Pertwee and Tom Baker on television, with in-theatre monitors showing pictures of Pertwee's face before Trevor Martin emerged as the newly-regenerated Doctor. In its original run, it also featured Wendy Padbury as one of the companions, making her the first actor to ever play two different companions in BBC-licensed productions.

Decades after its original run, it was adapted for audio by Big Finish.

Summary
The Doctor and his two newest companions, Jenny and Jimmy, prevent the Daleks and their crab-like slaves, the Clawrantulars, finding the seven crystals of Karn which would enable them to control all life in the universe.

Cast

 * The Doctor - Trevor Martin
 * Jenny - Wendy Padbury
 * Jimmy - James Matthews / Simon Jones
 * Jedak - Ian Ruskin
 * Tara - Patsy Dermott
 * Garm - Anthony Garner
 * Master of Karn - Simon Jones
 * Marko - Robin Browne
 * Clawrantulars - Peter Jolley, Mo Kiki, Peter Whitting
 * Dalek Emperor - Jacquie Dubin
 * Dalek voices - Peter Jolley

Crew

 * Writer - Terrance Dicks
 * Designer - John Napier
 * Director - Mick Hughes
 * Sound - Philip Clifford
 * Production Supervisor - Trevor Mitchell
 * Production Coordinator from the BBC - Barry Letts
 * Fight Arranger - Mo Kiki
 * Monster Coordination - James Acheson

Other productions
A licenced production of the play took place in New Zealand in 1984. Mounted at the Porirua Little Theatre, the production starred Michael Sagar as the Doctor, who was given a markedly different look from the original Trevor Martin portrayal, as he now sported a light-coloured chequered suit and a black moustache.