Medic Peso Penguin isn’t fond of scary situations, but if someone is hurt or in trouble he can be the bravest Octonaut of all. Only Peso can save the day when a cone snail invades the Octopod and picks off the crew one by one with its dangerous harpoons. In other episodes the Octonauts enlist an undersea detective to find Peso’s missing patient, and recruit a shape-shifting mimic octopus to recover some important medicine.