The Mission Controller turns up personally at the Moonbase with a very special mission for Cosmo. She is going on holiday and wants Cosmo to take care of her little dog, Quantum. When the dog runs riot in the Moonbase, Mum suggests they take him somewhere for a walk. Somewhere far. Uranus perhaps. Cosmo and Dad take Quantum to Uranus where they go on a space walk and Cosmo finds that the little dog and the huge planet have something in common.
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