- Duke as Adult Timmy
- Anges (from Despicable Me) as Jenny
- Sean (from Journey 2: The Mysterious Island) as Young Martin
- Mel as Evil Martin
- Dr. Nefario (from Despicable Me) as Justin
- Silas Ramsbottom (from Despicable Me 2) as Mr. Ages
- Max as Young Timmy
- Gru (from Despicable Me) as Troy
- Max and Duke's Owner as Cynthia
- Kailani (from Journey 2: The Mysterious Island) as Teresa
- Chloe as Mrs. Brisby
- Vector (from Despicable Me) as Jenner
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