Flash Gordon, Dale Arden and Dr. Hans Zarkov travel to the planet Mongo to fight the evil emperor Ming the Merciless who is secretly giving military technology to Hitler.
Despite Filmation reuse and overused of recycled cells (notably Ming laughing) this truly is one of Flash Gordon's greatest adventures. The setting and scenes ooze the imagination, with giant statues, palaces, space crafts and monsters. The 1980's live action movie borrows plenty from this Filmation film. Although shown in 22 December 1983 in the UK on ITV it was split up and used as the bases of the Saturday morning series Flash Gordon (1979).
Written by Samuel A. Peeples, whose credits include the original Star Trek series, its packed with great action set ups and array of memorable characters including the voice talent of Melendy Britt as Aura (later she voiced She-ra) and Ted Cassidy's Chewbacca lion like Thun. It's only short coming is that Dale Arden is sorely underused, reduced to a damsel in distress.
It's edgy, has a great atmosphere and even delivers a twist ending that outdoes it's 1980's live action counterpart.