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From the liner notes

Black Mask (1996)
Action has a new superhero—Black Mask—in this dazzling and explosive martial arts extravaganza! Following his harrowing escape from the secret, superhuman, commando unit known as Squad 701, Black Mask (Jet Li) takes on a new identity as a quiet librarian named Tsui Chik. His life of normalcy is shaken when a murderous rampage against all of Hong Kong's drug dealers is linked to Squad 701, forcing him to return as the Black Mask in order to stop their campaign of murder before it's too late!

Bloodsport IV (1999)
When martial arts expert–and–cop John Keller (Daniel Bernhardt) infiltrates death row to uncover the truth behind the execution of several inmates, hejoins the ranks of prisoners forced to fight in battles staged for pleasure by a sadistic Warden (Darek McGrath). The best fighters are turned over to Caesar, an eccentric underworld madman. In Caesar's secret playground, Keller discovers that he must compete in an ancient Japanese event of Kumite, where fighters from different martial arts backgrounds battle for survival. But instead of fighting for honor, Caesar's Kumite is a spectacle of violence and death aimed at entertaining the most bloodthirsty of audiences.

Kickboxer (1989)
Accompanied by his brother Kurt (Jean-Claude Van Damme), American kickboxing champion Eric Sloane (Dennis Alexio) arrives in Thailand to defeat the Eastern warriors at their own sport. His opponent: ruthless fighter and Thai champion, Tong Po. Tong not only defeats Eric, he paralyzes him for life. Crazed with anger, Kurt vows revenge. After a crash course in the ancient techniques of kickboxing from Thai master Xian Chow, Kurt challenges Tong. Their battle to the finish, born of lust, power and revenge, will leave only one man standing.

Kickboxer II (1991)
In "Kickboxer" we saw how Kurt Sloan (Jean-Claude Van Damme) was victorious in his fight against the brutal Tong Po (Michel Qissi). But Tong Po is not so easily defeated and in a burst of rage guns down the champion as he prepares to leave Thialand. For Tong Po's manager Sangha, this is a disgrace he cannot bear, for the kickboxing championship can't be regained unless he can goad Kurt's younger brother David (Sasha Mitchell) into the ring to fight Tong Po for the title. Under the watchful eye of his brother's trainer Xian (Dennis Chan) he must enter the ring and face the lethal kickboxing skills of Tong Po, risking everything, including his life, to avenge the insane violence of the deadly Thai fighter.