When Marcus is woken by a dog doing a poo on his bed, he is understandably upset. And Blacky (the dog) has other surprises in store. Soon Marcus and his disruptive friend Dylan are on a mission to rescue God - a sick, pygmy bearded dragon from the local pet shop. But time is running out. And then there is Rose who thrives on terrorising her little brother. She is The Sister From Hell, but revenge will be sweet. Or so Marcus thinks…