Joan Blondell plays Phyllis Britt, battle-axe wife of philandering cabby and TV fan Joe Britt (William Demarest). After Joe accuses his TV repairman (creepy Sterling Holloway) of being a conman, he discovers that his television set now receives a new channel, one that broadcasts his secret affair, as well as events yet to come.
Blondell and Demarest put in broad performances, playing caricatures of a married couple who should have long ago called it a day; their constant bickering and hurtful comments makes for uncomfortable viewing and one wishes that one of them would just leave before the inevitable violence erupts. It is never entirely clear whether Channel 10 is a manifestation of Joe's troubled conscience, or whether the supernatural is at play (although Holloway's reappearance at the end suggests the latter); either way, both Phyliss and Joe wind up paying dearly.
Is the moral of the story that people should know when to call it quits, or is the message anti-technology: that watching TV can cause people to confuse reality and fantasy? Nah... the message is to treat repairmen with respect, otherwise you might find yourself with an appliance powered by The Twilight Zone.