This one's a doozy, Tekken the Motion Picture.

Right from the beginning we see child Kazuya comfort his friend Jun until father of the year Heihachi arrives to throw Kazuya off a cliff for being weak.
Kazuya survives selling his soul to the devil for revenge.
Jun now an Interpol agent working with Lei Wulong, infiltrate the Tekken tournament set up by Heihachi Mishima in order to investigate what the Mishima Zaibatsu are up to on a private island where the tournament is held.
Kazuya reunites with Jun but Kazuya is fixated on his revenge, surviving run ins with the Williams Sisters sent by Lee Chaolan, along with other fighters and beasts while Lei Wulong with Jack and a mysterious girl finds Dr Bosconovitch for answers as to what's going on.
All leading to a climax with Kazuya fighting Heihachi to the death while Jun helplessly looks on.
This movie has the same problem as most Fighting game anime, it nevers takes full advantage of the extended cast of characters instead only focussing on a small handful of plot relevant characters, would've been nice to see what Paul, King and Yoshimitsu could do but they are limited to cameo only, the story is a weird mash up of the first three Tekken games with the least content coming from Tekken 3, it's only when you really play later games where you see how much of a curveball the cast is in terms of personalities with Lee Chaolan suffering the most, not helped by a laughable dub that contains some god awful acting.
You are much better off playing the games, at least you can choose which character to focus on story wise.
Final Verdict: A poor attempt to translate the Tekken games into anime, failing to take advantage of it's extended cast in favour of a poorly mashed up plot.