Frankenstein - Zweikampf der Giganten

Russ Tamblyn's performance in The War of the Gargantuas (1966) felt distant because his dialogue was re-dubbed under unusual circumstances. It has been previously claimed that the original audio track was lost, but that might not be the full case. At a 2004 screening, Tamblyn explained that, after filming, producer Henry G. Saperstein had all mentions of "Frankenstein" removed from the UPA version, requiring him to re-dub his lines. He resisted, insisting on rewriting them, leading to clashes with recording director Riley Jackson. Despite claims of Tamblyn improvising much of the dialogue and relying on memory/reading lip movements to re-dub it, according to Jackson, Tamblyn was actually tricked into a cold reading, which was secretly recorded and used in the final cut.

In the scene where a helicopter is used to lure the green gargantuan into the laser attack, the wire used to suspend the model helicopter can clearly be seen.

Co-producer Henry Saperstein commissioned an English-dubbed US version using Glen Glenn Sound, a Los Angeles-based company. This version removes references to the preceding film, Frankenstein Conquers the World, with the creatures being referred to as "Gargantuas" instead of "Frankensteins." However, this version also includes additional footage not featured in the original Japanese version, including the scene where Dr. Stewart references a severed hand, supposedly Frankenstein's from the previous film.

Edited into Frankensteins Höllenbrut (1972)