Stanley and Livingstone (1939)

When American newspaperman and adventurer Henry M. Stanley comes back from the western Indian wars, his editor James Gordon Bennett sends him to Africa to find Dr. David Livingstone, the missing Scottish missionary. Stanley finds Livingstone ("Dr. Livingstone, I presume.") blissfully doling out medicine and religion to the happy natives. His story is at first disbelieved. When Livingstone later dies, Stanley returns to continue the good doctor's work (which, of course, never really happened).