[1] This is the sixteenth episode of the third season, and the cast includes Barry Sullivan, Severn Darden, and Edmond O'Brien.
[1] A publisher, Glenn Howard (Gene Barry), while driving and dictating a memo to the President regarding the saving of the environment, finds himself suddenly plunged 46 years into the future only to learn that the people of Los Angeles are living underground to escape the pollution which has made living on the surface no longer possible.
He considers, then refuses when he discovers that the corporations are still emitting pollutants into the air, further destroying the atmosphere.
At the end, Howard wakes up to discover it was all a dream—apparently he passed out in his car from carbon monoxide inhalation from the dash vents.
As he drives away there is a chilling final image of a dead bird that hints at a troubled future ahead.