The Good Dr. Robotnik arrives at the Meeting place with Metal Sonic, as he's unaware that it's really metal mephiles in control of the enter meeting, as per his mission directives from Cybelle. and after a while, Black Doom arrived and says "I hear you have some information on our shared enemy?" and he was unaware that there was about to be a fight between the two of them. (You play black doom, alright?)