Ace Ventura: Pet Detective Jr.

Ralph Waite

Grandpa Ventura

Jeff Chase

Pennington's Bodyguard

Ann Cusack

Melissa Ventura

Josh Flitter

Ace Ventura, Jr.

Art LaFleur

Russell Hollander

Reed Alexander

Quenton Pennington, Jr.

Jessica Blackmore

Assistant with White Horse (uncredited)

Terry Loughlin

Horse Owner

Brian Patrick Clarke

Quenton Pennington Sr.

Cullen Douglas

Dr. Sickinger

Aubrey Shea

Daniella

Tom Hillmann

Trooper

Jim R. Coleman

Judge

Emma Lockhart

Laura Wilson

William Haze

Magician

Veryl Jones

Museum Security Guard

Adam Vernier

Agent #1

Jeremy Palko

CSI Agent (uncredited)

Carina Conti

Tara

Noah Schnacky

Swim Team Boy (uncredited)