there was a Jack Grimes who worked with Titra Dubbing (along with Peter "Speed Racer" Fernandez, who wrote most if not all of Titra's dub scripts). i believe Hal (Barney Miller) Linden dubbed Akira Kubo (at least according to the IMdB).
i have a really nice DVD copy of this and SMOG MONSTER both with the AIP original dubs. anyone interested should PM me, i'd be happy to help.
Two other great stars are often missed in this movie: Yoshio Tsuchiya ( I forget his character's name in the film) and a very-little seen Susumo Kurobe, aka Hayata from the 1966 Ultraman
TV series. You have to look quickly to see Kurobe because he's one of the hypnotized thugs on the beach scene where they have the shootout. Kurobe was also one of Dr. X's henchmen in King Kong Escapes.