Regarding Gregh_S_H's spoiler...
Warning: Spoiler! (Click to show) That guy has been revealed.... and if you don't want to know. STOP READING... Still here, OK, I warned you... it's Nathan.
As for my feelings on the episode, What Adam Said. I was watching the episode with trepidation just waiting for it to suck (a terrible way to go into any art, but there you go). I realized 15 minutes in that I'd just had a very enjoyable 15 minutes of Heroes.
In fact, the only thing that really bothered me in the whole episode was Hiro continuously turning his back on Sylar while talking to, comforting, etc. Charlie. You don't turn your back on Sylar, I don't care if he's made a deal. Does anybody here doubt Sylar would back out of a deal to serve his own purposes. Maybe Hiro turns his back and Sylar simply cuts his head open anyway and takes his power. It's completely within Sylar's character to say, "I don't care what happens then, I care what happens now." Or maybe, "I'll just take your power and go see for myself." I can think of any number of reasons Sylar would back out. That bit was sloppy, but the rest was good.
It was nice to see Charlie again after seeing her on Glee. I didn't realize they were the same actress until this episode. Turns out she also played Hiro's love interest in Bruce & Lloyd:Out of Control (Get Smart).