- HD 1080
- Runtime: 85m.
- Status: Released
- 1
- Languages: en
- Country: United States of America
- Director: Shin Sang-ok
- Stars: Victor Wong, Charles Napier, Michael Treanor, Max Elliott Slade, Chad Power
- keywords: underdog, martial arts, hero, sibling relationship, crime fighter, rivalry, corporate crime, environmentalism, escapade, save the day, young heroes, heroic mission, righting the wronged, buddies, master warrior
- Production_studio: TriStar Pictures
- Slogan: Tum Tum, Colt and Rocky are back for all new non-stop Ninja action!
- providers: Amazon Prime Video, Amazon Prime Video with Ads
- The 3 Ninjas Knuckle Up is featured in the top rankings of 1995
- #35 in Top Family Movies of 1995
- #44 in Top Adventure Movies of 1995
- #90 in Top Action Movies of 1995
Rocky, Colt and TumTum must battle an evil wealthy toxic waste dumper in order to save a local Indian tribe and their friend Joe. The 3 Ninjas must help find Joe's father and find a secret disk that contains evidence that could stop the toxic landfill that is destroying the Indian community. However the town is owned by the rich man and he controls the police and even the mayor. They must fight a motorcycle gang and renegade cowboys in this non-stop ninja adventure.