• 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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