he Blockheads are having some harmless fun with their giant crossbow one day when they notice Gumby, Pokey, and Minga walking into a planetarium on the page of some book. Being the thoughtful lads they are, they decide to enhance the experience by cutting out the page, tying it to an arrow, and shooting it into an outer space book. When Prickle and Goo show up to pick them up, they find the page missing and begin to investigate. After interrogating a parrot puppet and a doll, they piece the whole story together and decide to get Professor Kapp's help. Meanwhile, the star show at the planetarium is over, which it is very important that we know before the cartoon ends.