Fathom is a 1967 British spy comedy film directed by Leslie H. Martinson, starring Raquel Welch and Anthony Franciosa.

She accepts a lift from a man called Timothy and is taken to see Douglas Campbell, who convinces her that he is a British agent working for NATO and wants Fathom to help him find a triggering mechanism for a nuclear weapon that has gone missing in the Mediterranean.

Campbell now convinces her that he is the trustworthy one and Merriwether the deserter, and Fathom boards a plane with him and Timothy, but they promptly attempt to toss her from it with a defective parachute.

Now revealed as the good guy, Merriwether, with the leverage of Fathom's passport which he has, persuades her—after she passes over the villa and tosses the Fire Dragon down to Jo-May Soon to return it to China—to meet him later in a bar.

It was written by Lorenzo Semple Jr and directed by Leslie Martinson who had just made the film of the TV show Batman.

"[8] Second unit director Peter Medak later said of working with Welch: She was at that time quite inexperienced, exactly like one of those American drum majorettes.

[20] The U.K. theatrical release was cut with the British Board of Film Classification giving a U (Universal) Suitable for all rating.

"[8] The Monthly Film Bulletin wrote: "This comedy-thriller from the director of Batman belongs not in the category of High Camp but in that of Good Wholesome Fun.

But Fathom's biggest surprise is Raquel Welch, who gives an enchanting performance as the heroine, an amateur Modesty Blaise who wears the shortest of skirts and the lowest of necklines but exudes an air of bewildered indignation when anyone so much as tries to kiss her.

Clive Revill is suitably sinister as Serapkin, whose abnormally low body temperature requires him to wear an off-white body-stocking even in his most amorous moments.

"[23] The Los Angeles Times film critic said that "each new Raquel Welch picture brings further proof that when Maria Montez died they didn't break the mold.

Ronald Fraser plays the Scotsman and Clive Revill is called upon to overplay a mysterious character named Serapkin, one of those out to get the Fire Dragon.

Technical credits are exceptionally well executed, particularly the parachute sequences devised by Ken Vos and filmed by Jacques Dubourg.

Regular photography by Douglas Slocombe is interesting, as is art direction by Maurice Carter, and Max Benedict's editing is fluid.