Featured movie of the 8th episode of the seventh season of Mystry Science Theater 3000 (1989). It was accompanied by the short, "A Day at the Fair."
Despite sharing almost the same name as the theatrically released Diamond Head and both co-starring France Nuyen, the two movies have nothing to do with each other.
Both Harry Endo and Zulu where regulars on the original "Hawaii Five-O.
Many of the actors have a connection to Star Trek and Star Trek: The Next Generation. Clyde Kusatsu played Vice Admiral Nakamura in "The Measure of a Man," "Phantasms," and "All Good Things." (ST:TNG) Ward Costello played Admiral Gregory Quinn in "Coming of Age," and "Conspiracy," (ST:TNG) France Nuyen played Elaan, in "Elaan of Troyus." (TOS) Alex Henteloff played Dr. Nichols in "Stat Trek IV: The Voyage Home."
The only shared credit of Eric Braeden and France Nuyen, who had villainous human roles in Huida del planeta de los simios (1971) and Batalla por el planeta de los simios (1973), respectively.