Doctor Who and the Carnival of Monsters

The Doctor and Jo land on a cargo ship crossing the Indian Ocean in the year 1926. Or so they think. — Far away on a planet called Inter Minor, a travelling showman is setting up his live peepshow, watched by an eager audience of space officials... — On board ship, a giant hand suddenly appears, grasps the Tardis and withdraws. Without warning, a prehistoric monster rises from the sea to attack...

What is happening? Where are they? Only the Doctor realises, with horror, that they might be trapped...