Abbadiah and Zebbidiah Jones are twins from Buffalo, New York; they prefer to go by their nicknames, Twink and Tom. The twins enjoy watching cowboy serials on the family TV set, customized by their scientist father with its own wall-sized projection screen. While the twins are watching the TV one afternoon, the normal picture changes into a strangely beautiful scene with a castle in the background. They are confronted by a living toy clown, a duplicate of the familiar toy they have named Twoffle. This living version, who calls himself Twiffle, persuades them to walk into the screen before them; the two children find themselves magically transported into the scene.