Ox (オックス) is a boss from Alex Kidd in Miracle World.
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The Ox is a large red bull which is fought at the end of the Village of Namui. All it does is constantly charge forward, changing its direction when reaching the corners of the screen. Every time it gets hit it is pushed back before resuming his charging, becoming faster every time.
In Alex Kidd in Miracle World DX the Ox was given a new design, now sporting brown fur and resembling more a bison. The fight was also changed around, as it now charges at the player, only becoming vulnerable upon slamming it head onto the walls.