Two friends get drunk and decide to switch identities. One is a Parliamentary Secretary, and the other is the captain of a ship. The former's lack of sea knowledge causes several catastrophes, including torpedoing the First Lord of The Admiralty. The grass is always greener.... In this British comedy, two drunken comrades find out the truth of that saying when they decide to trade places for a while. One of the boozers is a public relations man who knows nothing about sailing, while the other is a captain for the Royal Navy. Comic mayhem ensues as the hapless "captain" tries to run his ship and follow orders.
John (Alan Ladd), a blacksmith and swordsmith, is tutored at Camelot. As a commoner, he can't hope to win the hand of Lady Linet (Patricia Medina), daughter of the Earl of Yeoniland (Harry Andrews), so he creates a secret alternate identity as the Black Knight. In this new role, he is now able to help King Arthur when Saracens and Cornish men—disguised as Vikings -- plot to take over the country.