AllMovie

This Disney family adventure, directed by Robert Stevenson in his Jules Verne mode, concern a group of explorers who travel to the Arctic Circle in 1908 to explore the uncharted wastes of the North Pole. Sir Anthony Ross (Donald Sinden), a rich Londoner, organizes an Arctic exploration team in hopes of locating his missing son. Providing expert advice is Prof. John Ivarson (David Hartman), a professor of Nordic history. As the group explores the frozen tundra, they come across an unknown valley, skirting the borders of a giant volcano, that turns out to be a lost Viking kingdom.