Sonic&Knuckles 3 Hidden Palace Zone - Sonic vs Knuckles.
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It's Sonic vs Knuckles. This battle takes place within' the Hidden Palace Zone, in a room which has a weird mural in the background which seems to predicts the Sonic chasing down Dr Robonik at The Dooms Day Zone.( http://www.youtube.com/watch?v=NTmIEymeSwo )
This fight is unique from any other bosses before, you fight another animal instead of a machine, he also has his own pattern of attacks, if you wait long enough; he will end up spindashing, if you walk upto him, he'll punch you. Well. You can work out the rest yourself.
Then after the battle you get to be-friend Knuckles after witnessing him gettin' tricked by Dr Robotnik(Eggman). You can help or not, either way Knuckles will end up breaking a wall down which you wouldn't be able to do without him, after that you need to continue your adventure alone.
Note: You can view this video in 720p!