The Island at the Top of the World is a 1974 Disney film, starring Donald Sinden and David Hartman.
In London in the year 1907, a British aristocrat named Sir Anthony Ross (Donald Sinden) hastily arranges an expedition to the Arctic to search for his lost son Donald. Donald had become lost on a whaling expedition to find the fabled island where whales go to die.
Sir Anthony employs the talents of a Scandinavian-American archaeologist Professor Ivarsson (David Hartman) and Captain Brieux (Jacques Marin), a French inventor/aeronaut who pilots the expedition in a French dirigible named the Hyperion, (which, naturally, Captain Brieux invented). Upon reaching the Arctic, they meet Oomiak, a comically cowardly/brave Eskimo friend of Donald’s, and trick him into helping them join in the search.