all of them fly to a new camp in the jungle. spalko tells jones that she believes that the skull was made by aliens and that it holds great power. there, jones finds that "mary williams" is actually marion ravenwood, his old lover. he also finds oxley, who is out of his mind, rambling and unable to speak a full sentence. jones finds out what oxley is saying. as the soviets and jones figure out where to go, williams starts a fire and tries to get them to escape. jones and ravenwood fall in quicksand and start sinking. as they sink, ravenwood tells jones that williams' real name is henry jones iii and that he is jones's son. williams uses a snake to get them out of the sandpit. they are recaptured.