- Director:Leslie H. Martinson
- Writer:Lorenzo Semple Jr.,Larry Forrester
- Cast:Anthony Franciosa,Raquel Welch,Ronald Fraser
- Time:1h 39min
|Complete credited cast:|
|Anthony Franciosa||-||Peter Merriwether (as Tony Franciosa)|
|Raquel Welch||-||Fathom Harvill|
|Ronald Fraser||-||Colonel Campbell|
|Ann Lancaster||-||Mrs. Trivers|
|Reg Lye||-||Mr. Trivers|
Fathom's name was an amalgam of the first names of the character's uncles who were called (in order of the letters in Fathom's name) Freddie, Arthur, Tom, Harry, Oscar and Milton.
Richard Briers has claimed in interviews that he finds the plot of this film hard to fathom.
Peter Merriwether's convertible sports car is a 1965 Ferrari 275 GTS.
H.A.D.E.S stood for Headquarters Allied Defences, Espionage & Security.
This movie was based on Larry Forrester's second "Fathom' novel, which was never published and was only in draft form when this film was made. Forrester's first "Fathom" novel was called "A Girl Called Fathom", published in 1967.
Fathom correctly packs the parachute at the beginning of the movie.
One of the few films to receive Roger Ebert's "Zero Stars" rating (0/4).
The bullring around which Fathom is pursued is the oldest functioning bullring in the world, at Mijas in Andalusia. Mijas is also the location for Fathom's hotel. However, the rest of the (unnamed) town in these scenes, including the beach and the side-entrance to the bullring, can be found in other parts of Spain.
The name of this movie's MacGuffin was the Fire Dragon. At first, it is described as a failsafe device that can explode a hydrogen bomb via an electronic signal but turns out later to be a a priceless Oriental ceramic treasure from the Ming Dynasty.