This film is based on the 1895 novel by H. G. Wells. Traveling from the end of the 19th Century to the year 802,701, the inventor finds that mankind has evolved into two races: the underground Morlocks hunt the aboveground Eloi. Eventually the time traveler saves the Eloi from the Morlocks, destroys the time machine and builds a life among the Eloi. The time traveling is one-dimensional. Time as the fourth dimension is identified as the factor that makes time travel possible. There is an enjoyable scene in which the inventor explains the role of the fourth dimension to skeptical friends.
The Time Machine. Dir. George Pal. Perf. Rod Taylor, Alan Young, Sebastian Cabot. DVD. MGM. 1960.