Plot:
In Japan, Captain Jai-Tai is recruited by the Special Chief of military operations. He is to infilitrate China
and retrieve several maps of Chinese military base locations before an invasion of mainland China.

Now, I'll demonstrate my 'sack of kitten
drowning' evil...
In China, Captain Lee Chang is studying martial arts before asking to go undercover for a police mission to catch
a new gang that is heavily in the human slavery racket.

Why do you keep saying I look like Sonny Chiba?
In Shanghai's dock, Jai Tai and his partner are talking with the gang leader: Mr. Lin, who is sure this is just
some sort of illegal business deal. Gang guy decides to demonstrate his evil by picking a fight with the shoeshine
guy. Couple of the hero types jump in to help the shoe shiner.

This is what we call a fight...
Undercover cop handles the gang and tells Lin how he wants to join the gang when Lee walks up to look for a
job, too. Lee demonstrates his Kung Fu.
Lin is impressed by them.

Why I'll hire you for my criminal gang if you can walk as cool
as anyone in a John Woo movie...
They spot Jai Tai and the inherent uncanny sense is kicked in...
At Lin's mansion, Lin has brought out a guy that is accused to a be a police spy. Lee is to demonstrate how to
handle police spies. Lee stabs the guy who broughtly gets up. Lee claims he recognized the knife was a fake.
That night, Lin has a party and brings in some girls. Undercover cop and Jai's partner get in a fight in Anna, the Russian girl. Jai Tai orders his partner to quit. Anna and Undercover walk off. Out of distance, he gets her away from
the gang.
The next day, Captain and his partner discuss Jai Tai. They don't know anything about Jai espionage mission.
Elsewhere, Jai Tai talks with Lin. Jai is sure that Captain and his partner are police spies.
Captain and his partner are told about the next shipment of human smuggling. Captain is positive it is some sort of
trap to entrap them. His undercover partner sneaks off and tells Anna to report about the shipment to the police. She reveals that her friend Little Joker is searching for his missing sister and is sure the gang got her.
That night, the gang crates up a number of girls. Lin delays the shipment for a test and switches the crates with those set with bombs. If the police open any of them, that'll mean that Lee and his partner were police spies.
Anna and couple of her friends manage to overhear Lin's plan. They head off to warn the police.
The next day, Little Joker, one of Anna's friends, pick some guy's pocket and finds a map. Lee sees the map and realizes its of Chinese bases. He tries reporting to the polcie about the Japanese spy ring which they don't believe in. Lee learns that Jai Tai is a Japanese spy.
Lee chases after Jai. Let the fighting begin. Jai's partner drives up and runs into Lee several times but that doesn't seem to stop him. Jai and his partner drive off but Lee grabs on top of the roof. Partner slows Lee by fighting him. Jai drives off.
Little Joker chases after Jai before their fight. Jai wounds him and heads off.
Undercover versus Jai's partner who is finally dispatched.
Jai runs to meet the retrieval boat but is sort of delayed when Lee appears on the boat. Lee versus Jai once more with martial arts before breaking out the sais and clubs.

This is real...Quit playing like you're Raphael, the Teenage
Mutant Ninja Turtle...
Lee finally get Jai and the maps.
Undercover partner and Anna are checking on Little Joker who is mortally wounded. He asks that Lee find his sister. They agree to find her, and he dies.