Mister Rogers' Neighborhood (1968)

S24E9 Going Away and Coming Back

In this episode, Rogers creatively utilizes a lengthy plumbing pipe to illustrate a tunnel, allowing blocks and a toy car to move through it. Mr. McFeely presents a video showcasing the experience of driving through a car wash. Meanwhile, in the Neighborhood of Make-Believe, King Friday learns about the quest for a missing tunnel. Lady Aberlin discovers the various parts of an old parable related to the tunnel, which is located near X's tree, bringing the story full circle.