Whale of a Squid.The Kratt Brothers use Aviva's amphipod-inspired submersible, the Amphisub, to dive into the deep waters of the Southern Ocean. There, they witness a never-before-seen wildlife moment: a battle between a sperm whale and a giant squid. However, the water pressure at the extreme depths where the battle is taking place badly damages and partially crushes the Amphisub, forcing Aviva to use her new ExtendoArm invention to pull the submersible back to the Tortuga. To allow Chris and Martin to return to the site of the whale-versus-squid battle, Aviva programs two new Creature Power Suits—Sperm Whale Power for Chris, and Squid Power for Martin. The Kratt Brothers use their new Creature Powers to dive back into the deep sea, where the sperm whale and the giant squid are still locked in combat. Suddenly, the sperm whale becomes entangled in a discarded fishing net and begins sinking toward an area full of underwater volcanoes. To make matters worse, a colossal squid attacks the sperm whale's calf. Chris and Martin must put their Creature Powers of both sperm whale and squid to good use to rescue the mother sperm whale and her calf.