Creepy Crawlers is the best-known name associated with an activity toy made by Mattel beginning in 1964. A more generic term for the toy is "Thingmaker". A Thingmaker toy consists of a series of die-cast metal molds, into which are poured a liquid chemical substance called Plasti-Goop, which came in many colors and varieties. The mold is then heated atop an open-face electric hot plate oven. The Plasti-Goop is cured by the heat, and when cooled, is removed from the mold, forming solid, rubbery replicas of insects and other creeepy things.
A Thingmaker toy consists of a series of die-cast metal molds, into which are poured a liquid chemical substance called Plasti-Goop, which came in many colors and varieties. The mold is then heated atop an open-face electric hot plate oven. The Plasti-Goop is cured by the heat, and when cooled, is removed from the mold, forming solid, rubbery replicas of insects and other creeepy things.