...why Atlantis disappeared! Although Hercules often calls upon his Father ,Zeus -note that his son never invokes his granddad-,this is as far from Greek mythology as it can be.
"The famous Four" best describes the plot: Hercules ,his son,Androcles (a Roman slave handed over to lions then granted an imperial pardon ,what is he doing here?) and a dwarf feel that Grece is in jeopardy.This is the beginning of an "epic" story which includes a rubber monster,a wicked queen (Antinea of course ,see one of the numerous versions of Pierre Benoit's " L'Atlantide" ),the ancestors of the clones (unless it predates Hitler's Aryan supermen),the perils of atomic radiations (?) The first scene is an interminable free-for-all in which Hercules,who is quietly enjoying his meal ,does not interfere ("help us dad!"screams his son) .Some not-so-bad scenes show a strange Androcles wandering in the queen's palace .
It's rather silly,but it's entertaining if you do not ask too much.