Battle Arena Toshinden is a pair of OAVs sold together as one "movie." Yet another scrappy group of video game characters saves the world from a street fightin' bad guy. In this particular adventure, it just so happens that the bad guy (Gaia) has teamed up with another villain to put together the know how to rebuild people into super-powerful cyborgs. But, these cyborgs have an advantage over just strength--they can copy all those cool special moves you have to push a bunch of buttons to do in video games, and all they have to do is watch the original in action. One of these cyborgs (who looks too much like Sho, Eiji's borther, for comfort) starts attacking good guys and using their own moves against them (starting, of course, with the less popular characters). It isn't too long before our hero and his amnesiac friend, Sofia, find out that this isn't the original, and deal with him. This wouldn't be so bad, except he was just the prototype, and there are more like him on the way. Behind everyone is this mysterious villain and the vengeful (and now cybernetic) Chaos. It's going to take a lot of fighters and a lot of fighting to save the world.
To quickly run throught the characters, we have Eiji and Kayin, the studly pair (think Ryu and Ken, only from Scotland and Japan this time), Sofia, a former street fighter with amnesia and a serious maternal streak, Gaia (the villian from the first game), a somewhat enigmatic mostly bad guy, Chaos, an old rival of Eiji and Kain (now with cybernetics), and then this mysterious third villian controlling things from behind the scenes. Most of the other characters show up too (Rungo, Ellis, Fo, Mondo, etc), but their parts are, for the most part, rather small (Fo is onscreen for all of about 30 seconds, and some of the others don't fare much better). But, if you're a fan, at least they show up.