- Max as Phineas
- Duke as Ferb
- Chloe as Candace
- Gru (from Despicable Me) as Lawrence
- Grammy Norma (from Dr. Seuss' The Lorax) as Linda
- Hank (from Journey 2: The Mysterious Island) as Perry the Platypus
- Kailani (from Journey 2: The Mysterious Island) as Isabella
- Sean (from Journey 2: The Mysterious Island) as Baljeet
- Max and Duke's Owner as Stacy
- Mel as Dr. Doofenshmirtz
- Silas Ramsbottom (from Despicable Me 2) as Grandpa Reggie
- Snowball as Albert
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