The other reviews are pretty spot-on in assessing this as utter drek, but oddly nobody has mentioned the ludicrous scene in which Judy Geeson - worst actress of 1968 without a doubt - suddenly bursts into song. After a good hour (which seems like a lifetime) of Geeson's high pitched, twelve year old schoolgirl voice, she appears in a nightclub 'singing', only her voice has been dubbed by a Madeline Bell soundalike (for those who aren't familiar with Miss Bell, she is a husky voiced jazz singer of the Shirley Bassey type). A more unsuitable voice double for Judy Geeson would be hard to imagine! The only plus in the entire film is the great Diana Dors, injecting interest and style into a project sadly lacking in both departments.

For years I thought Victor Mature was the most uncharismatic, untalented actor to have ever managed to succeed in Hollywood, but now, ladies and gents, I stand corrected. That dishonor must go to the, er, "star" of Hammerhead, Mr Vince Edwards. In short, he's an utter bore. As is the movie. But my God, is he dreadful. His face is like a catcher's mitt, just expressionless throughout the whole movie. His voice is one note of droning monotony and as for his physical presence, well, I suspect most of the action was performed by a double as they consisted mostly of suspicious close ups of legs and arms being thrust in the direction of bad guys without ol' Vince's hammerface in the shot.Won't bother with the plot, critique the direction or soundtrack ... sufficed to say it all pretty much stinks.I'm a massive spy movie fan - seen 'em all pretty much - especially the 60s adventure ones, and I must say this movie is easily one of the worst. Even the mostly incomprehensible Italian stuff of the same era is a lot more fun and watchable than this rubbish. The only good thing from Hammerhead are the girls. Plenty of them and all pretty.

This has to be one of the worst movies I have ever seen. I watched it on television years ago, my wife and I have used it as a standard for the worst ever sense. It was so bad, I turned it off, thought maybe it would get better, turned it back on, three times. Even the music was terrible. HammmmmmmmmmmmmmerHead, still rings in my ears.

i loved this when i saw it on tv umpteen years ago. as i remember it, it was among the more stylish of Bond ripoffs; & of course, tres-60's. but the only image that sticks with me (SPOILER ALERT) is a scene of mass dancing on the beach, while the timer ticks down that will destroy the world. and it does...