Kronos is slightly different from other 1950's/Atomic age sci fi's as the 'monster' that threatens the world in this one is a massive robot, Kronos. This was released on video in America as part of the excellent Science Fiction Gold collection, of which I have a copy.
A giant object crashes into the ocean and turns out to be a flying saucer. Scientists are sent to investigate, but one of them gets possessed by an alien and starts acting strange. At the same time, something strange rises out of the ocean and turns out to be a giant robot, Kronos. Two of the scientists land on top of it by helicopter to examine it. It then starts going on the rampage, destroying everything in its path. A nuclear bomb is dropped on it to try to destroy it, but this makes things worse as Kronos uses nuclear energy to get stronger. A method is found to destroy it in the end though and turns out to be a success.
For a low budget movie, the special effects are quite good and the music score is rather creepy.
The movies stars 50's sci fi regulars Jeff Morrow (This Island Earth), Morris Ankrum (Invaders From Mars), John Emery (Rocketship XM), Robert Shayne (Teenage Caveman) and Morrow's love interest is played by Barbara Lawrence. Morrow, Ankrum and Shayne also appeared together in The Giant Claw, made the same year as Kronos, 1957.
This movie is a must for fans of 1950's sci fi, like me.
Rating: 3 and a half stars out of 5.