Ηθοποιοί

• Jim Carrey — Tom Popper
• Frank Welker — The penguins (vocal effects)
• Clark Gregg — Nat Jones
• Madeline Carroll — Janie Popper
• Ophelia Lovibond — Pippi
• David Krumholtz — Kent
• Philip Baker Hall — Franklin
• James Tupper — Rick
• Dominic Chianese — Reader
• William Charles Mitchell — Yates
• Kelli Barrett — Tommy's Mom
• Maxwell Perry Cotton — Billy
• Carla Gugino — Amanda
• Angela Lansbury — Mrs. Van Gundy
• Jeffrey Tambor — Mr. Gremmins
• Brian T. Delaney — Young Tom Popper, Sr. (voice)
• Elaine Kussack — Gremmins's Secretary
• Harlin C. Kearsley — Town Car Driver
• Desmin Borges — Daryl
• Lee Moore — Reginald
• Dominic Colón — Tito
• Jeff Lima — Freddy
• J.R. Horne — Arnold
• Matthew Wolf — Antarctic Friend (voice)
• Andrew Stewart-Jones — Animal Control Guy
• James Chen — Fish & Game Officer
• Rafael Osorio — Marine & Waterfowl Officer
• Olga Merediz — Nanny
• Betsy Aidem — Tavern Hostess
• Angel Caban — Fishmonger
• Charles L. Campbell — Old Tom Popper, Sr. (voice)
• Daniel Stewart Sherman — Zoo Security Guard
• Mike Massimino — Cop #1
• Charlie Semine — Cop #2 (Quint)