Stanley goes to East Africa accompanied by his Indian scout from the Wyoming Territory days, Jeff Slocum (Walter Brennan), and under great peril from jungle fever and cannibals, tracks his prey down in the jungle of Tanganyika and utters his famous greeting: “Dr. Livingstone, I presume?” Though seriously ill, Livingstone is blissful tending to the natives’ medical needs and preaching the gospel and declines to return with Stanley. Problem is that when Stanley returns home, he’s not believed and accused by rival publisher of the London Globe, Lord Tyce (Charles Coburn), of fraud since he offers no tangible proof. When brought to trial word leaks out that Livingstone dies and that his last request written in a letter is that Stanley carry on the work that he began. This vindicates Stanley and the new convert to the good cause goes back to the jungle to carry on Livingstone’s saintly mission (a fiction created by the film).