This six-episode story line from the iconic British sci-fi TV show follows the time-traveling Doctor Who (Jon Pertwee) as he combats the nefarious Master and his new TOMTIT (Transmission of Matter Through Interstitial Time) device. Learning that the Master has used an artifact from Atlantis to summon a time-eating monster called Kronos, the Doctor and his assistant Jo Grant (Katy Manning) journey to the watery city to thwart the villain's plans.