Another adaptation of this story was done for the BBC anthology series Out of the Unknown in 1969.
Although the end credits indicate the couple's name is "Full," they are referred to as "Fulbright" throughout the episode.
This episode is based on the short story "The Little Black Bag" by C. M. Kornbluth. The story was first published in Astounding Science Fiction (July 1950).
Although the patent date on one of the instruments reads July 18, 2450, the doctor reads it as July 15th. Later in the story, the doctor refers to the instruments as coming from the 21st century.
Doctor Fulbright: Oh, I'm tired. Tired.
Angie: Oh, you poor little man. What do you know about being tired? I'm tired, too. Tired of wearing shabby clothes, tired of living in cheap rooms and listening to your excuses. Tired? What from? You haven't earned a dollar in a month.
Pawnbroker: I--I thought maybe you'd come to take something out. You know, your watch, perhaps.
Doctor Fulbright: A man has nothing to do, he needn't keep track of time.
Doctor Fulbright: Now you tell me how much I can get on that bag.
Pawnbroker: Okay. Okay, but I hate doing it. So I can let you have $25.
Doctor Fulbright: $25. For twenty-five years. No profit in that. I'll take it.