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Tom Baker
The Doctor

Mary Tamm
Romana

John Leeson
K-9 (voice)

John Woodvine
Marshal

Lalla Ward
Princess Astra

Davyd Harries
Shapp

Ian Saynor
Merak

Ian Liston
'Hero'

Susan Skipper
'Heroine'

John Cannon
Guard

Iain Armstrong
Technician

Pat Gorman
Pilot

Harry Fielder
Guard

William Squire
The Shadow

Barry Jackson
Drax

Valentine Dyall
The Black Guardian