Atlantis, The Lost Continent (1961)
While at sea, the Greek fisherman Dmitrius (Sal Ponti, as Anthony Hall) finds a girl adrift and rescues her. She claims to be Antilea (Joyce Taylor), a Princess of Atlantis. While tending her, Dmitrius falls in love with her. Recovering, she tries to steal his boat. He stops her but she challenges him to sail to her home where she promises to reward him with great riches. They set forth but are instead captured by an Atlantean submarine. Back in Atlantis, he, like all outsiders, is made a slave. He curses her name, although she is unaware of what has happened to him. Dmitrius takes the only recourse – to fight for his freedom in the arena – in order to win his Princess and stop the plans of the king’s power-mad advisor to declare war on the outside world.