Howard is very keen on building a bomb shelter in the back yard in order to protect his family in the event of a nuclear war. This is a very realistic episode given that World War II was a recent memory and the Soviet threat was ever-present during this Cold War era.
The idea of the shelter seems to be a good one until Richie's friends all ask for a place in it as well. Meanwhile, after some consideration, the family aren't too sure that the shelter is necessary, and Howard begins to have his own doubts after a moving speech from Richie in which he outlines what it would be like for the survivors of such an horrific event.
An excellent episode with a very good moral to the story.