This movie compilation of Ultraman: A Special Effects Fantasy Series (1966) was distributed by Toho Company Ltd. as a co-feature for their then-latest SF/monster film, King Kong vs. Godzilla (1962).
One of the few films for Toho Company Ltd. (the film's distributor) to have a fanfare in its logo at the beginning.
This compilation film was originally intended to be an all-original feature-length film entitled "Ultraman - Operation: Giant" ("Urutoraman - Jaianto Sakusen"), which featured the Baltan Aliens as the main villains. Although a complete screenplay was written, the funding never materialized.
The ringtone of the phone at Science Patrol headquarters is the same sound made by the iconic Toho monster "Ghidorah".