 Josh Flitter as a character Ace Ventura Jr | Josh Flitter also starred in the next movies:- "Hide and Seek" in a role of Little Boy;
- "Air Buddies" in a role of Budderball;
- "License to Wed" in a role of Choir Boy;
- "Nancy Drew" in a role of Corky;
- "Snow Buddies" in a role of Budderball;
- "Horton Hears a Who!" in a role of Rudy;
- "Space Buddies" in a role of Budderball;
- "Santa Buddies" in a role of Budderball;
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 Emma Lockhart as a character Laura | Emma Lockhart also starred in the next movies:- "The Seeker: The Dark Is Rising" in a role of Gwen Stanton;
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 Austin Rogers as a character A-Plus | Austin Rogers starred only in the movie "Ace Ventura: Pet Detective Jr." |
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 Jason Nathaniel Powers as a character Park Guest | Jason Nathaniel Powers starred only in the movie "Ace Ventura: Pet Detective Jr." |
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 Adonis Stevens as a character DJ the Security Guard | Adonis Stevens starred only in the movie "Ace Ventura: Pet Detective Jr." |
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 Chris Adler as a character Pennington Jr's Body Guard | Chris Adler also starred in the next movies:- "Beethoven's Big Break" in a role of Crew Member;
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 Robie Alan as a character Special Government Agent | Robie Alan also starred in the next movies:- "Beethoven's Big Break" in a role of Film crew member;
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 Reed Alexander as a character Quenton Pennington Jr | Reed Alexander also starred in the next movies:- "If I Had Known I Was a Genius" in a role of Gifted kid #1;
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 Christian Andreas as a character Guard in dinosaur chase | Christian Andreas also starred in the next movies:- "The Year of Getting to Know Us" in a role of Uncle Sam;
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 Karl Anthony as a character Laura's Dad | Karl Anthony also starred in the next movies:- "The Year of Getting to Know Us" in a role of Golfer #2;
- "RoboDoc" in a role of Victim #1;
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 Sam Bauso as a character FBI Agent | Sam Bauso starred only in the movie "Ace Ventura: Pet Detective Jr." |
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 Harrison Boxley | Harrison Boxley starred only in the movie "Ace Ventura: Pet Detective Jr." |
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 Connor Boyle as a character Seth | Connor Boyle also starred in the next movies:- "The Year of Getting to Know Us" in a role of Young Nickie Apple;
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 Justin Brown as a character Churro Guy | Justin Brown also starred in the next movies:- "Hannah Montana: The Movie" in a role of Fundraiser Dancer;
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 Jeff Chase as a character Penningtons Guard | Jeff Chase also starred in the next movies:- "All About the Benjamins" in a role of Mango;
- "Mission: Impossible III" in a role of Davians Gaurd;
- "Transporter 2" in a role of Vasily;
- "The Year of Getting to Know Us" in a role of Arnold;
- "The Spy Next Door" in a role of Russian;
- "The Slammin' Salmon" in a role of Anthony;
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