Make no doubt about it. This is probably the single greatest thing ever shot to film:
Undefeatable reaches a level of transcendence that no other film in history has been capable of. This movie raises the bar for action/martial arts movies and its doubtful that the rest of the entertainment industry will ever be able to meet its dizzying heights.
To summarize: Cynthia Rothrock plays our protagonist, a waitress struggling to get by and put her younger sister through college. She doesn't make much money waiting tables, so she supplements her income by taking street fights....for piles of delicious cash!
While this is happening, a martial artist named Stingray (actor Don Niam in a tour de force role) suffers a mental break when his wife leaves him. He is hellbent for blood and in his unstable state he begins torturing any girl who resembles his wife. Perfectly understandable, I know. But he crosses the line once he sets his sights on Rothrock's younger sister and winds up killing her. This sends Rothrock on a collision course....FOR REVENGE!
Here's Stingray, the ladies' man himself:
There are other plot points, but none of them as important as this clip of the climatic fight scene.
http://youtube.com/watch?search=best+fight+scene+ever+&v=Ie60lRVd4ac