A young boy named Sosuke rescues a goldfish named Ponyo, and they embark on a fantastic journey of friendship before Ponyo's father forces her to return to the sea. Ponyo's desire to be human upsets the balance of nature and only Ponyo's mother, a beautiful sea goddess, can restore nature's balance and make Ponyo's dreams come true.

Scrat is still trying to nab the ever-elusive nut and maybe finding true love; Manny and Ellie await the birth of their first-born mammoth; Diego the saber-toothed tiger wonders if he's growing too 'soft' hanging with his pals; and Sid the sloth gets into trouble when he creates his own makeshift family by hijacking some dinosaur eggs. On a mission to rescue the hapless Sid, the gang ventures into a mysterious underground world, where they have some...