Mumble,is the son of Memphis and Norma Jean.He is knowns as the worst singer in Emperor-Land.But he has ability to dancing,and when he growns up,he seems has the fluffy down.Then he meets Gloria,his love interest,and also wants to know who take the fish and make a contact with aliens.
- Elijah Wood as Mumble the main protagonist
- Robin Williams as Ramon the deurtagonist and Lovelace the triagonist.
- Brittany Murphy as Gloria the love interest of Mumble.
- Hugh Jaackman as Memphis Mumble's father.
- Nicole Kidman as Norma Jean Mumble's mother.
- Hugo Weaving as Noah the Elder the leader of the penguin nation.
- Carlos Alazraqui as Nestor
- Johny A Sanchez as Lombardo
- Lombardo Boyar as Raul
- Jeffry Garcia as Rinaldo
- Steve Irwin as Trev the elephant seal.
- Magda Szubanski as Mrs Viola
- Miriam Margolyes as Mrs Astrakhan
- Fat Joe as Seymour
- Elizabeth Daily as Baby Mumble
- Alyssa Shafer as Baby Gloria
- Cessar Flores as Baby Seymour
- Anthony La Paglia as Yellow Leg the boss Skua leader of the skuas and the main antagonist.
- Frank Welker as the Killer whales and the final antagonists of the film.
- Roger Rose as the Leopard Seal and the secondary antagonist.
- The Song of the Heart,performed by Prince
- Hit Me Up,Performed by Gia Farell
- Tell Me Something Good,performed by P!nk
- "The Joker" mash-up with "Everything I Own",The Joker performed by Jason Mraz and Everything I Own by Chrissie Hynde
- I Wish,performed by Fantasia,Patti LaBelle, and Yolanda Adams
- Boogie Wonderland,performed by Brittany Murphy and featuring Lombardo Boyar
- Somebody to Love,performed by Brittany Murphy
- My Way(A Mi Manera),performed by Robin Williams
- Do It Again,performed by The Beach Boys
- Jump N Move,performed by The Brand New Heavies (Feat. Jamalski)
- Kiss/Heartbreak Hotel,performed by Nicole Kidman and Hugh Jackman
- Golden Slumbers/The End,performed by k.d lang
- The Story of Mumble HappyFeet,the instrumental music,written and produced by John Powell
A sequel called Happy Feet Two was released on November 18 2011. Elijah Wood, Robin Williams, and Hugh Jackman reprise their roles as Mumble, Ramon and Lovelace And Memphis.