All Cast

Tom Baker

Tom Baker

The Doctor

Mary Tamm

Mary Tamm

Romana

John Leeson

John Leeson

K-9 (voice)

Beatrix Lehmann

Beatrix Lehmann

Professor Rumford

Susan Engel

Susan Engel

Vivien Fay

Nicholas McArdle

Nicholas McArdle

De Vries

Elaine Ives-Cameron

Elaine Ives-Cameron

Martha