Though Heroes is serialized and changing the past screws with a timeline that might be important to some (hopefully, anyone ascribing to the show would realize that time isn't a "line" as it were, and to look at each moment, or even point in time, as its own story, with its own changes), Hiro's plight to make things "right" (whatever that may be) is actually very interesting to me. After all, things may never be right. Though time-travel may seem to some as the all-powerful singular ability, changing the past has future consequences or may not even have the desired affect. Feeling impotent is a bitch, especially when you've spent years (as the future Hiro has) trying to fix the past, all to find only failure (thus far). After all, just about every power portrayed thus far has found pros and cons.