A young frontier scout helps guide a freight wagon train across the country, fighting off Indians and evil traders, while his two crusty companions try and save him from falling in love.

Megalomaniac and would-be world dominator Roxor has kidnaped Robert Regent, along with his death ray invention, in hopes of using it to degenerate humanity into mindless brutes, leaving himself as Earth's supreme intelligence. Faced with revealing the machine's secrets or allowing his family to die a horrible death at the hands of Roxor, Regent's only hope lies with the intervention of his brother-in-law, the be-turbaned yogi and magician Chandu, who has the power to make men see what is not there 'even unto a gathering of twelve times twelve'

Boudu, a tramp, jumps into the Seine. He is rescued by Mr Lestingois, a gentle and good bookseller, who gives shelter to him. Mrs Lestingois and the maid Anne-Marie (Mr Lestingois' mistress) are far from delighted, for Boudu is lazy, dirty and salacious…

13 years before the movie opens, there was a dinner party, at which the 13th guest failed to show up. The master of the manner has died, and left the bulk of his estate to this 13th guest, but nobody knows who that is. Now someone is murdering the remaining guests, and placing their dead bodies at the table, in the same seat they had occupied 13 years before.