Doctor Gulliver is poor, so nothing - not even his charming fiancée Elisabeth - keeps him in the town he lives. He signs on to a ship to India, but in a storm he's washed off the ship and ends up on an island, which is inhibitated by very tiny people. After he managed to convince them he's harmless and is accepted as one of their citizens, their king wants to use him in war against a people of giants. Compared to them, even Gulliver is a gnome.

A cruel Roundhead Colonel is on the trail of royalist sympathizers, but unaware of his daughters royalist sympathies. When she falls into a love triangle with Cavalier Edward Beverly and Roundhead officer Captain Sylvester the stage is set for double crossing and derring-do.

It is the end of the 18th century and smuggling is considered to be a legitimate spare-time occupation for most fishermen around the British shores. But when a gang of cut-throats, led by the infamous Black John (Bernard Lee) begins to lure ships onto the rocks of Smugglers Bay, and murdering their crews for the sake of loot, the fishermen begin to fear for their livelihoods. In desperation, they appeal to the local magistrate Squire Trevenyan (Peter Cushing).