Movie about a Human Duplicating Machine?

[stella]

About 28 years ago, I saw a movie in which I remember the scene, but I couldn't find out the name of the movie. If someone remembers this scene, then please tell me the name. Thanks so much in advance.

It was a science fiction movie (or it could have been a show) that involved a human duplication machine that sort of looked like a medal detector. If a person walked into that machine, a second identical person will come out.

In the final climax, there was a shootout between the hero dressed in blue, and the villian dressed in red. The shootout was in a huge laboratory that featured that duplication machine. After a brief shootout between the two men, the villian ran through that machine so that there were now two villians. The hero soon did the same thing. After a while, each group ran through that machine so that there was at least 100 heroes vs. 100 villians all engaged in a fist fight in that room.

Eventually, one of the 100+ villians decided to fill the room with poisonous gas and then using a machine gun, proceded to destroy the machine and then killed all the heroes as well as his fellow villians. Just when all people in the room were killed, one hero was still alive. And that remaining hero managed to defeat the remaining villian.

I know, this description sounds kind of silly . But it is the truth and that's my best recollection.

Does anybody recalling such a scene? If so, what was the movie?