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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!
During a championship baseball match, the three brothers hear that their grandfather in Japan is in trouble, and head out to help him, conceding the match. When they arrive in Japan, they must use all their powers to defend him against his ancient enemy, who has returned to exact revenge.
Three young boys, Rocky, Colt and Tum Tum together with their neighbor girl, computer whiz Amanda are visiting Mega Mountain amusement park when it is invaded by an army of ninjas led by evil Medusa, who wants to take over the park and hold the owners for ransom. Kids and retired TV star Dave Dragon, who made his farewell appearance at the park at the time the ninjas appeared, have to break Medusa's vicious plans.
Former Minister of National Security, Park Jin-wook, is kidnapped from the US by South Korean agents because he was about to reveal secrets concerning the rise of the military dictatorship of the 1980's.
Kang-hie recalls from her cell how she was used by Japanese detectives to track down and destroy the Korean Independence fighters. She manages to escape from prison during a break and proceeds to hunt down her former lover who was a Japanese agent.
Song Ryul returns to the countryside to see his ill father. After his cousin conspires with the Japanese occupiers to sell their crop, Song Ryul is forced to emigrate to Kando (Jiandao) in Manchuria. His family faces numerous adversities there and after a row with a local pharmacist, he is imprisoned. The prison is raided by Kim Il-sung and his guerrillas, who free the inmates, who take revenge on the Japanese by blowing up a railway.
In feudal Korea, a group of starving villagers grow weary of the orders handed down to them by their controlling king and set out to use a deadly monster under their control to push his armies back.
South Korean Air Force pilots engage in perilous missions against Communist North Koreans during the Korean War.
In the latter years of the Korean Empire, Lee In Hwa, disguises herself as a man so she can join a group of young men determined to overthrow the colonial government. They fight together with young national activists presided by Hwal Min and supported by Daewon-gun, the Prince Regent, against Min Gyeom Ho and his peers. But Min and his team perform a surprise attack on Hwal Min and his peers.
The widow of a nobleman bears a son after having an affair with her servant. The servant and the baby are driven from the home by the woman's irate in-laws when the truth is discovered. Even after the child is grown, no contact is allowed between he and his mother who now denies the events of her past.