Blue's Clues/Millie's Math House


 * Mrs. Pepper as Millie
 * Pail as Dorothy
 * Birdbrain (from T.U.F.F. Puppy) as Big
 * Dandace (from Phineas & Ferb) as Middle
 * Dipper (from Gravity Falls) as Little
 * Grover as Harley
 * Mr. Salt as The Rabbit
 * Mailbox as The Mouse