The Indian Ocean, 1935 - or is it? The Doctor and Jo arrive on the SS Bernice, a ship due to mysteriously vanish without trace. But why do events seem to repeat themselves, and why is a plesiosaur attacking the ship? Meanwhile, on the planet Inter Minor, travelling showman Vorg arrives with his remarkable Miniscope...
Elenco: William Hartnell , Patrick Troughton , Jon Pertwee , Tom Baker , Peter Davison , Colin Baker , Sylvester McCoy .