Jason and the Argonauts
Great effects, the first half hour was pretty uneventful and the revenge plot really went nowhere, but Harryhausen’s effects hold up and it was quite the spectacle.
IIRC, they were thinking of a sequel, (hence the line from Zeus I have not yet finished with Jason) but the movie didn’t do as well as it should have at the box office because many people thought it was yet another Italian sword and sandal flick. Ironically, I’ve seen some of those movies use the same locations as Jason.