Mumble the penguin has a problem: his son Erik, who is reluctant to dance, encounters The Mighty Sven, a penguin who can fly! Things get worse for Mumble when the world is shaken by powerful forces, causing him to brings together the penguin nations and their allies to set things right.

This is the story of a little penguin named Mumble who has a terrible singing voice and later discovers he has no Heartsong. However, Mumble has an astute talent for something that none of the penguins had ever seen before: tap dancing. Though Mumble's mom, Norma Jean, thinks this little habit is cute, his dad, Memphis, says it "just ain't penguin." Besides, they both know that, without a Heartsong, Mumble may never find true love. As fate would have it, his one friend, Gloria, happens to be the...