In a series of live action and animated vignettes, the evolution of humanity is depicted and explored, primarily through the experiences of Cathy, a tour guide in a natural history museum, and Lee, a college student infatuated with her.
The two stars (seen here) were Ms. Principal and the kid from The Rifleman, who was also one of the original Mouseketeers.
Video (It’s from a Blu-Ray, but it’s much too dark to see anything.)