- Sam Kydd - Police Sergeant Questioning Rosie
- Maurice Kaufmann - Marsh (uncredited)
- John Wynn - Detective Sergeant Best (uncredited)
- Jane Asher - Little Girl (uncredited)
- Toke Townley - The Chemist (uncredited)
- Margaret Anderson - Maggie (uncredited)
- Eric Corrie - Maggie's Boyfriend (uncredited)
- Henry B. Longhurst - George (uncredited)
- Ernest Hare - Crash Site Fire Chief (uncredited)
- Michael Godfrey - Crash Site Fireman (uncredited)
- Marianne Stone - Central Clinic Nurse (uncredited)
- John Kerr - Photo Lab Technician (uncredited)
- Bartlett Mullins - Zookeeper (uncredited)
- Mayne Lynton - Zoo Superintendent (uncredited)
- Barry Lowe - Nurse Tucker (uncredited)
- Jane Aird - Mrs. Lomax (uncredited)
- Molly Glessing - Mother at Zoo (uncredited)
- Arthur Gross - TV Show Floor Director (uncredited)
- Basil Dignam - Sir Lionel Dean (uncredited)
- Donald Gray - TV Program Announcer (uncredited)
- Gron Davies - Charles Greene (uncredited)
- Stanley Van Beers - Ludwig Reichenheim (uncredited)
- Arthur Lovegrove - Sergeant Bromley (uncredited)
- James Drake - Sound Engineer (uncredited)
- Val Guest
- Richard H. Landau
- Val Guest
- Nigel Kneale
- Anthony Hinds
- James Bernard
Brian Donlevy interpreta a Bernard Quatermass en la película.
Jack Warner interpreta a Inspector Lomax en la película.
Richard Wordsworth interpreta a Victor Carroon en la película.
Margia Dean hace el papel de Judith Carroon.
Thora Hird interpreta a Rosie Wrigley en la película.
Gordon Jackson interpreta a BBC TV producer en la película.
David King-Wood interpreta a Gordon Briscoe en la película.
Harold Lang interpreta a Christie en la película.
Lionel Jeffries interpreta a Blake en la película.
Sam Kydd interpreta a Police Sergeant Questioning Rosie en la película.
Maurice Kaufmann interpreta a Marsh (uncredited) en la película.
John Wynn interpreta a Detective Sergeant Best (uncredited) en la película.
Jane Asher hace el papel de Little Girl (uncredited).
Toke Townley hace el papel de The Chemist (uncredited).
Margaret Anderson interpreta a Maggie (uncredited) en la película.
Eric Corrie interpreta a Maggie's Boyfriend (uncredited) en la película.
Henry B. Longhurst interpreta a George (uncredited) en la película.
Ernest Hare interpreta a Crash Site Fire Chief (uncredited) en la película.
Michael Godfrey hace el papel de Crash Site Fireman (uncredited).
Marianne Stone interpreta a Central Clinic Nurse (uncredited) en la película.
John Kerr interpreta a Photo Lab Technician (uncredited) en la película.
Bartlett Mullins interpreta a Zookeeper (uncredited) en la película.
Mayne Lynton interpreta a Zoo Superintendent (uncredited) en la película.
Barry Lowe interpreta a Nurse Tucker (uncredited) en la película.
Jane Aird hace el papel de Mrs. Lomax (uncredited).
Molly Glessing interpreta a Mother at Zoo (uncredited) en la película.
Arthur Gross hace el papel de TV Show Floor Director (uncredited).
Basil Dignam interpreta a Sir Lionel Dean (uncredited) en la película.
Donald Gray interpreta a TV Program Announcer (uncredited) en la película.
Gron Davies hace el papel de Charles Greene (uncredited).
Stanley Van Beers hace el papel de Ludwig Reichenheim (uncredited).
Arthur Lovegrove hace el papel de Sergeant Bromley (uncredited).
James Drake interpreta a Sound Engineer (uncredited) en la película.
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