From The TimeSplitters Wiki

Splitter Crow is the final form of Crow that you see. He is part human, part TimeSplitter, and part robot; it is the form that Crow thinks has made him invincible, which was his whole plan during the game. You first fight him twice, after the first time, he teleports before you finish him off. Then you fight him in the last level, Future Perfect, where you need to shoot out his hands and feet, and while he can't move or shoot you shoot at his back. He is not unlockable for Arcade mode due to his massive size and his non human shape.