King Humpback Whale has his tail caught under a sunken ship! Diego, Blue, Sprinkles and Baby Humpback set off on an ocean journey to rescue King Humpback Whale - by jumping over nets, splashing their tails fast to get away from the orcas, and diving down to the bottom of the ocean. Last, they must blow giant bubbles with their blowholes to make the ship float up, up, up, and release King Humpback. Hooray!