There has been a lot of speculation on this. If it is someone we already know, the most likely possibilities are: Peter or HRG. I'm thinking HRG because you can see the classic Horn Rimmed Glasses when he turns his head as he walks away. (replay it)
It could be peter. But he probably wouldn't need a gun. And he could be invisible.
Possibly Sylar, but he was in NY at the time. So I doubt it.
So it is confusing, especially since the guy is thin like Sylar, walks like Peter, but has glasses like HRG.
So it's probably someone new.
QUOTE (EternityForever @ Feb 5 2008, 12:24 AM)

That is my theory or speculation. Anything can happen in this drama. Yes, I watch the show and if you can think of any reason why Kaito refuse to intervene and live again then you can make such an ignorant statement. Kaito obviously had the same ability as Hiro, and Kaito knew it but is not sure until he saw what Hiro did. In addition, unless the script team for Heroes blows, many characters have the same abilities don't they? They must have genetic connections. I think you need to take some biology + sociology courses before you are given the permission to judge others with your egocentric perspective. kthx bye.
As someone said, Kaito had never teleported before. So he and Hiro don't have the same powers.
Nathan and West are not related... In fact, Nathan is Claire's father, so therefore Adam can't be her father. (plus, that would make West and Claire bro and sis, and they were into each other and kissing...)
DL and Micah had different powers...
We dont know what Arthur's power was, so we can't say for sure that he and Peter are the same.
So far... Matt and Maury are the only ones who have the parent/child match.
So your theory is bunked.