

Each year, three brothers Samuel, Jeffrey and Michael Douglas visits their Japanese grandfather, Mori Shintaro whom the boys affectionately refer to as Grandpa, for the summer. Mori is a highly skilled in the fields of Martial arts and Ninjutsu, and for years he has trained the boys in his techniques. After an organized crime ring proves to be too much for the FBI, it's time for the 3 brother NINJAS! To use their martial arts skills, they team up to battle the crime ring and outwit some very persistent kidnappers!
Practical Effects
Pre-CGI fight scenes with actual child stunt doubles.
Acting
Victor Wong's Grandpa — unbothered, moisturized, thriving.

Director
Jon Turteltaub
Trivia, insights & behind the scenes
The three leads had zero martial arts experience before filming and trained for months. The 'Hi-yah' was entirely their own chaotic invention.
Victor Wong, a Berkeley-educated actor and former contributor to Flower Drum Song, brought unexpected gravitas to what could've been a stereotype. His Grandpa became the film's accidental heart.