American Ninja 4: The Annihilation

Hiro is introduced as the last of the true Ninjas, trained by his granduncle Master Tetsu. At just 12 years old, Hiro has faced significant loss, including the tragic deaths of both his parents, leaving him sheltered by Tetsu.

After Tetsu leaves town, he sends Hiro to apprentice under the legendary American Ninja, Joe Kastle. Hiro shows more interest in his Game Gear than in learning the ancient ways of the Ninja from Joe.

On Joe's boat, which serves as a meeting place, he meets Lisa, who mistakenly 'varnishes' his boat. The two share an unexpected connection, and Lisa expresses her hard work over the weeks.

Lisa is revealed to be the daughter of Dr. Strobel, who is being coerced by the industrialist Glock to create a dangerous nerve gas for General Zubino. With time running out, Dr. Strobel faces dire consequences for his failure.

Glock resorts to kidnapping Lisa to ensure her father complies with his demands. He enlists the help of the Ninja, Viper, escalating the stakes significantly.

During a dinner with Joe, Hiro witnesses Lisa being abducted by Viper and his team of Ninjas. This shocking event motivates Hiro and Joe to take swift action to rescue her.

Determined to save Lisa, Joe and Hiro sneak aboard a plane to Venezuela. They arrive to find chaos, further complicating their mission.

Shortly after arriving in Venezuela, Joe is arrested, leaving Hiro to fend for himself. Hiro’s frustration leads him to ask for help from the American Embassy, but the process proves painfully slow.

Determined to rescue Joe, Hiro hijacks the convoy meant to transport him to prison. His bravery showcases his growth as a character despite his young age.

Hiro undertakes a rigorous training regimen led by Joe, rediscovering his inherent Ninja skills. This training prepares them for the challenges ahead as they plan to infiltrate Glock's operation.

With newfound skills, Joe and Hiro infiltrate Glock's facility to rescue Lisa and her father. Together, they face numerous obstacles and engage in intense Ninja battles.

In an explosive climax, Joe and Hiro confront Viper and thwart his dangerous schemes. The chaos escalates as the nerve gas is released during their struggle.

Amidst the chaos, Joe and Hiro manage to save Dr. Strobel from Glock's clutches. They find a way to trap Glock, turning his plans against him in a fitting defeat.

With their mission accomplished, Joe returns to Los Angeles. On his boat, he has a tender moment with Lisa, symbolizing a victory not just in combat, but in forging an important bond.