Pook is one the villains and main antagonists in Mother 4. While Pook may look like a teddy bear, he is actually a
ruthless assassin who has been trained only to kill. Sheldon and Jonathan first encounter Pook when he kidnaps Martin because he had been ordered to by Giygas to get information out of him about the Xecrex operation. Pook was killed when Mayor Jones used a powerful psychic punch to destroy his cybernetic heart. Before Pook died, he had planted a bomb in the base where the Xecrex operation was and it exploded, killing all the guinea pigs.