Diego and Alicia are studying penguins on Antarctica. She takes off in her yellow submarine, leading the penguins to their new schools. Suddenly, Diego hears a call for help from Pepito, a little penguin chick who got left behind. Diego and Pepito head off on an Antarctic adventure to find Pepito's school. Along the way, they meet the chinstrap penguins and play 'Simon Says,' then meet the Adelie penguins who invite Diego and Pepito to join in their music class. But it's not until Pepito swims across an icy lake that he finds his penguin school -- and learns he's an Emperor Penguin!