It's one of the biggest mysteries among Mega Man fans, the timeline goes from Classic -> X ->Zero -> ZX -> Legends. (which takes place in the far off future) There is information that pertains to what happened in-between the other various series, but the biggest mystery is what happened between the end of the Classic series and the X series. We do know that Dr. Light built X and Dr. Wily built Zero and they both passed away shortly after (or DID they? That's an interesting debate) But what happened to the original Mega Man as well as Roll, Proto Man and Bass? Nothing has ever been said about their fate. A popular theory is that Zero killed them, but Inafune refuted it as well as saying that Mega Man and X are not the same robot.
The interesting thing about the X series is that there are little nods that connect it to the Classic series. There were hints that Dr. Wily was still around in some form. In the Japanese version of X2, the character of Serges is HEAVILY implied to be Wily. He mistakenly calls X "Rock...ehhh.. X" suggesting that he mistook him for the original Mega Man and when he is defeated, he says "Defeated by the robotic memento of Light. Such regret." Something only Wily would say. In X5, it's severely hinted that Wily is around in some form, if Zero goes Maverick, a voice is heard that is rather strongly implied to be Wily's. X6 hints that Isoc and Wily are on the same... and then it's never mentioned again. If there is an X9, this plot thread needs to be revisited and resolved.
But what happened to the original Mega Man? It's something I myself have always wondered. (Nor do I think Capcom will ever reveal or depict it as that would mean they could no longer make Classic Mega Man games.)
The interesting thing about the X series is that there are little nods that connect it to the Classic series. There were hints that Dr. Wily was still around in some form. In the Japanese version of X2, the character of Serges is HEAVILY implied to be Wily. He mistakenly calls X "Rock...ehhh.. X" suggesting that he mistook him for the original Mega Man and when he is defeated, he says "Defeated by the robotic memento of Light. Such regret." Something only Wily would say. In X5, it's severely hinted that Wily is around in some form, if Zero goes Maverick, a voice is heard that is rather strongly implied to be Wily's. X6 hints that Isoc and Wily are on the same... and then it's never mentioned again. If there is an X9, this plot thread needs to be revisited and resolved.
But what happened to the original Mega Man? It's something I myself have always wondered. (Nor do I think Capcom will ever reveal or depict it as that would mean they could no longer make Classic Mega Man games.)