Ingeborg von Kusserow
Lea Blotz (as Ingeborg Wells)
M
Mae Bacon
Mrs. Briggs (as Mai Bacon)
Peter Sallis
Bill (Van Driver/Grocery Merchant)
Christopher Beeny
The Holy Terrors - Horation Flynn
W
Wendy Westcott
The Holy Terrors - Mary Huxley
I
Ian Smith
The Holy Terrors - Tom Chizzler
Anneke Wills
The Holy Terrors - Alice Nightingale (as Anneke Willys)
E
Ernest Scott
The Holy Terrors - Ernest Chappel
P
Patrick Wells
The Holy Terrors - Han Einstein Blotz
E
Elain Sykes
The Holy Terrors - Linda Chappel
P
Pat Hagan
Police Constable (uncredited)
J
Jack Sharp
Atomic Research Centre Gateman (uncredited)