Of course it's Sci-fi. The good old rousing space opera isn't the whole of Sci-fi. But I will admit this could be a bit like trying to define what genre a particular song should be tagged as. It's defiantly action/melodrama. It's most likely good that NBC isn't labeling it as Sci-fi, as that would most likely have stopped some viewers from tuning in.

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It doesn't seem that Present Hiro brought anything back from the future that prevented the disaster, unless it was truly Sylar that was supposed to be the bomb. Can anyone pinpoint what Present Hiro did to change things?

Old Hero did the kill your father thing by influencing the past, influencing Peter, Ando, and Young Hiro. It's a time paradox, or not, the Many Worlds theory of time was proposed to cover that kind of thing. So what young Hiro brought back was a changed mindset. He doesn't become General Nakamura.

It doesn't seem anyone necessarily got dead. Peter should heal. Nathan could drop Peter and fly away before the detonation. And Syler seems to have crawled off into the sewer.

That Peter hasn't used more than one power at a time is odd.

George Taki would seem to be both Immortal, or at least long lived, and Kensai the great Samurai. (look closely at the eyes of the last Samurai shown)

And finally, I want to know what Hiro's cuss word was. edit: subtitle was @#$%!