"The Long Morrow" is the saddest episode of "The Twilight Zone," as both lovers make sacrifices to be together but end up with the worst-case scenario. The episode explores the heartbreaking idea that timing can make or break a relationship, even if two people are perfect for each other. Despite his own emotional pain, Douglas still wants Sandra to be happy and encourages her to find someone else to share her life with.

Rod Serling’s classic anthology series The Twilight Zone was renowned for its spooky storylines and terrifying twists, but its most heartbreaking installment is season 5, episode 15, “The Long Morrow.” Throughout its run, The Twilight Zone delivered plenty of emotional gut-punches. In season 1, episode 8, “Time Enough at Last,” the last man on Earth decides to use his isolation to catch up on his reading, but then his reading glasses fall off and smash on the ground. In season 5, episode 3, “Nightmare at 20,000 Feet,...