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 … Victor Wong, Michael Treanor, Max Elliott Slade, Chad Power, Rand Kingsley, Alan McRae, Margarita Franco Added on Amazon Prime 2023-06-25. Youtube Trailer