While Prickle and Goo search for a hairbrush that's so important that it's only mentioned once, Gumby and Pokey enter a mirror, hoping to redeem the free hot fudge sundaes that a nearby sign promises them. Unfortunately, it's a trap set by the Blockheads, who shatter the mirror, trapping Gumby and Pokey in a strange other-world. When Goo fails to reassemble the mirror by reversing a tape recording of a note that shatters glass, Goo and Prickle get a clue and have Professor Kapp reassemble it with the most powerful plot device in the world.
