Bloodfist ii (1990)

Jake Ray gives up his title after killing a man in the ring. When Jake goes to Manila to help an old friend, trouble awaits him! After fending off multiple attacks, Jake is finally captured and chained to a half a dozen martial arts champions. Taken to an island fortress, they are forced to battle chemically-stimulated killers in fights to the death. To win - and to live - it will take every ounce of strength and skill in their martial arts arsenal