Shapeshifting snails on a mission to save the world! Struck by lightning one fateful night, Fergus and Shelby receive the power to transform into whatever they want: custard, crisp packets, giant plastic crabs – you name it, they can change into it. And with a slug uprising taking place, things are about to get even stranger... Can Fergus and Shelby save humankind from being turned into lettuces by an evil slug masquerading as the Prime Minister? Expect the unexpected in the best thing since sliced cucumber!