Kickboxer 4: The Aggressor is a 1994 direct-to-video release martial-arts film directed by Albert Pyun. The film is the fourth entry in the Kickboxer series. Sasha Mitchell is the only returning cast member from the series, reprising his role as David Sloan.
The film opens with a recap of earlier events in the series, as David Sloan writes a letter to his wife, Vicky. After being framed for murder, Sloan has spent the last two years in prison, while his wife has become the sexual captive of his old nemesis, Tong Po, who has since become one of the most powerful drug lords in Mexico.
Unable to apprehend him by their own means, the DEA learns that Po intends to host a martial arts tournament at his private compound, with the winner earning a match against Po and a $1,000,000 prize. Knowing the history between them, the authorities offer to release Sloan if he will enter the tournament and eliminate Po himself. Sloan eagerly accepts.
On his way to the border, Sloan saves a young woman...