cast * Dinko (Pet Alien) as Big Bird * Gumball (The Amazing World of Gumball) as Elmo * Chum Chum (Fanboy and Chum Chum) and Finn the Human (Adventure Time) as Bert and Ernie * Diego (Ice Age) as Cookie Monster * Fanboy (Fanboy and Chum Chum) as Grover * Sheriff (Cars) as Oscar the Grouch * Phineas (Phineas and Ferb) as Benny Rabbit * Isabella (Phineas and Ferb) as Abby Cadabby * Candace (Phineas and Ferb) as Lulu * Ferb (Phineas and Ferb) as Nelson * Baljeet (Phineas and Ferb) as Maurice * Stacy (Phineas and Ferb) as Lilly * Woody (Toy Story) as Telly Monster * Yo (Fanboy and Chum Chum) as Rosita * Hamm (Toy Story) as Baby Bear * Ariel (The Little Mermaid) as Zoe