Synopsis: A mysterious stranger shows up at Barnett College with an ancient key, and Dr. Jones puts down his grade book to go in search of his former archaeological colleague, Sophia Hapgood. Now a trendy psychic, "Madame Sophia" is doing very well for herself by fleecing people out of their hard-earned money. Toss in a tiny minotaur-like statuette, sprinkle in a few overzealous Nazis, and cue the music!
Indiana Jones and his companion, Sophia Hapgood, crisscross the globe in search of mysterious Atlantean artifacts first uncovered in a dig ten years ago. It seems the Nazis are also after these same artifacts, convinced they will unlock the secret to the legendary continent. From Reykjavik to Copenhagen to Rotterdam, Paris, Geneva, Lisbon, and the Azores, then finally onto the Yucatan, Indy and Sophie manage to stay one step ahead of their pursuers. Despite several narrow scrapes, they all arrive in Russia for a mad scramble to possess the lost dialogue of Plato, which is rumored to contain the secret to Atlantis.
With Plato's lost Dialogue safely in their grasp, Indy and Sophia are off to Morocco where they are pursued by a bunch of screaming Nazis and an oily new character named Omar Al-Jabbar, whose favorite mode of transport is a hydrogen balloon. Indy and Sophia manage to "liberate" the hydrogen balloon from the fat and sleazy Al-Jabbar in order to escape --problem is, neither of them knows how to pilot the damn thing! Eventually, of course, they get to Crete, go exploring the ruins of a labyrinth and wind up in the map room of the legendary Atlantis! How much do you want to bet those pesky Nazis aren't too far behind?
Just as Indy and Sophie get to fabled Atlantis, they find themselves in the clutches of those dastardly Nazis! With Indy in yet another tight fix, he turns to Sophie for some advice but unfortunately she has gone completely `round the bend, as a strange Atlantean spirit has taken control of her soul. Meanwhile, the Nazis are getting closer to reaching their goal and achieving god-like powers! It doesn't get any better than this, kids!