While they were scanning the sky in search of the comet Proteus, Barbabright and Lolita spotted a flying saucer approaching their house. Without wasting any time, Barbapapa woke up the whole family to discover the identity of these space travelers. But of course, they were their martian friends and they had a special guest with them: a baby with big feet mysteriously appeared on their planet. The Barbapapa then offered to find his family. Thus, a new mission is announced for Badabam, the rocket, which eagerly sniffs the baby's teddy bear in search of a trail in the stars