After a mysterious explosion leaves a large fissure in the ground, two young boys are confronted by an unknown phenomenon that inflicts severe radiation burns on one of them. There follows a spate of attacks at radiation establishments as the inexplicable life-form plunders radium stores. Dr Royston, an expert in atomic research, is brought in to explain and curtail the activities of this alien creature before it causes disaster.
|Dean Jagger||Dr. Adam Royston|
|Edward Chapman||John Elliott|
|Leo McKern||Inspector McGill|
|Anthony Newley||LCpl. 'Spider' Webb|
|Jameson Clark||Jack Harding|
|William Lucas||Peter Elliott|
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