US Army Lieutenant Colonel Glenn Manning (Glenn Langan) is exposed to radiation after a plutonium bomb test in Nevada and mutates into a giant – who grows ten feet taller per day – much to the distress of his fiancée Carol (Cathy Downs).
He puts on his best nappy and goes on a rampage through cardboard miniatures on the way to nearby Las Vegas, hunted down by his own men.
Meanwhile, realising that his heart will explode unless they halt the abnormal growth, doctors begin a desperate race to find an antidote.
The film is well-written, but the special effects are not always up to scratch – even by 1957 standards.
The colonel returned a year later (played by Dean Parkin) in the even worse War of the Colossal Beast.
Lt. Col. Glenn Manning
Dr Paul Lindstrom
Dr Eric Coulter
Bert I Gordon