Aldo’s cat Odin is different from all other cats, because he is . . . the REAL Odin – the Norse god of poetry and war reincarnated into a cat. Aldo, Odin and Petra are on a seaside holiday, and Petra wins a goldfish at the local fair. Petra soon discovers her goldfish is different – he is . . . the REAL Poseidon – the Greek god of the sea! Overnight a mysterious giant monolith appears on the beach, Aldo’s cousin Dylan turns into a zombie, and Poseidon’s son Triton is plotting to steal his Trident and rule the world. But first Triton needs to get hold of the fish . . . Aldo, his Comic Club friends, sister Petra and Odin must outwit Triton and his army of evil sea monsters in an epic battle to save Poseidon and the world!