Calvin and Hobbes by Bill Watterson for July 03, 1988
Calvin as Spaceman Spiff: Spaceman Spiff explores the outermost reaches of the universe. By popular request. Intrepid explorer Spaceman Spiff lands on an uncharted planet. What strange wonders will he discover here? Spiff sets out in search of sentient life! What a strange planet this is! It's surface is surprisingly soft and porous! And here curious geysers blast hot air! Suddenly it dawns on him! Spiff is not on the planet's surface at all! He's walking on a reclining alien!! Out hero sets his death ray blaster. Dad: Zzmmf hm?