The arrival of a mysterious comet heralds impending danger from enemies both old and new. As Ace helps the Doctor defend Earth, she is confronted with a dangerous question..."Doctor Who?"

Genres

Cast

Sylvester McCoy

The Doctor

Sophie Aldred

Ace

Anton Diffring

De Flores

Gerard Murphy

Richard

Leslie French

Mathematician

Dolores Gray

Mrs Remington

David Banks

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