Son of Hercules vs. Medusa (1963) on Netflix

Plot summary

Medusa lives by a lake and strikes at soldiers who come near. Her one eye petrifies anyone it looks at, and Argos uses her to charge heavy tolls on travelers passing through. Perseus is heir to the throne of Argos; his father, the true king, was killed by a usurper who then married his widow. Soldiers of an evil monarch capture Perseus and force him to fight as a gladiator. He wants to take down the man on his father's throne and to free Seriphos from Galenore, and before either can happen he must defeat a dragon and the monster of the lake. The finest warriors of Seriphos already stand as stone.