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?"
Sylvester McCoy
The Doctor
Sophie Aldred
Ace
Anton Diffring
De Flores
Fiona Walker
Lady Peinforte
Gerard Murphy
Richard
Leslie French
Mathematician
Dolores Gray
Mrs Remington
David Banks
Cyber Leader
Mark Hardy
Cyber Lieutenant
Metin Yenal
Karl
Courtney Pine
Himself
Chris Chering
Skinhead 1
