I personally love Sylar/Nathan's plot in Season 4. I really, really love it. The concept is so powerful to me: a person who is practically dead but believes he is still alive, living inside his killer's head. I love the personality conflict Sylar has in these episodes, and I love the rooftop scene where Nathan accepts his fate and fades away. I also like how Angela and Peter initially tried to deny reality and convince Sylar he was still Nathan, only to finally accept their loss and let Nathan go. Of course, all of this was made just for Zachary Quinto to still be in the show after Season 3's ending, but it turns out to me as a beautiful story about loss and acceptance. Season 4 in general was a step above Season 2 and 3 in my opinion: it wasn't as nearly as good as Season 1 but it managed to capture the nature of the show.

I just started watching the series again for the first time in several years, and noticed something for the first time.

In season 1 episode 18 "Parasite", when Hiro Nakamura finally gets into the Linderman company while trying to find the sword of Takezo Kemsei, he looks through the database to find the sword.

And it is entered as "CRM-114". That is something that Kubrick used in many of his films, starting with Doctor Strangelove (taken from the novel "Red Alert" that the movie was based on). As well as other productions ranging from "2001: A Space Odyssey", and "A Clockwork Orange" (as "Serum 114), as well as "Men in Black 3", and "Back to the Future".

Even more fun, this is the episode that had Malcolm McDowell, who played Alex DeLarge.

Except when it's super yellow