The Master is attempting to summon up Kronos, the Eater of Time, in order to gain the ultimate power. But in order to do this the Master will have to travel back in time to Atlantis. Now the Doctor and Jo must follow him in order to stop him from unleashing the greatest threat to all of time itself. A great plot, but it's ruined by not having enough action in it, a script that seems to drag on forever, and some corny parts added into it. It's worth watching, but not worth wasting your money on. Not recommended!