When Smurf wants to travel to outer space, he tries to build a rocketship, but it fails to get off the ground and he grows depressed. Papa Smurf and the other Smurfs make a plan to cheer him up: putting him to sleep and waking him up in an elaborately staged "planet" filled by other Smurfs pretending to be aliens!

Roland Goossand, popularly known as Gos, is a Belgian comics creator who was a frequent collaborator of Peyo's and wrote several Smurf stories. Gos also wrote for the comic "Spirou" and launched his own comics titles in Belgium in the 1970's including "The Scrameustach."