- Dr. Nefario (from Despicable Me) as Peter
- Grammy Norma (from Dr. Seuss' The Lorax) as Lois
- Mel as Stewie
- Duke as Chris
- Max and Duke's Owner as Meg
- Snowball as Quagmire
- Silas Ramsbottom (from Despicable Me 2) as Cleveland
- E.B. (from HOP) as Mort
- Max as Neil
- Mr. O'Hare (from Dr. Seuss' The Lorax) as Carter
- Chloe as Babs
- The Once-ler's Mom (from Dr. Seuss' The Lorax) as Connie D'Amico
- Vector (from Despicable Me) as Bertram
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