The third episode of “The Jetsons” is the show’s first in-depth look at the cars of the future. Titled “The Space Car,” the episode originally aired on Sunday October 7, 1962.

A man is on a mission to restore the world’s rarest bus, which boasts a bizarre, retro-futuristic design that resembles something you’d expect to see on The Jetsons. The little-known Citroen ...