Dexter on Showtime happens to be my favorite show on the air now. It's a serial killer who kills other serial killers and tries to keep his loved ones in the dark. I've also read all the Dexter novels by Jeff Lindsay and enjoyed them. Dexter: Early Cuts is a new animated (like an old Captain America/Spider-man cartoon from the 80s) web series written by Lauren Gussis, focusing on how he came to adopt his current methods. The artists for this 3 chapter, 12 episode series are names that will probably be familiar to you: Kyle Baker, Ty Templeton, Andrés Vera Martínez. The first video is a behind the scenes, the other videos are part 1 and 2 of the current chapter. Dexter is in it's 4th season it comes on Showtime Sunday nights at 9:00 ET. Dexter: Early Cuts is also a Sunday night program on the Showtime website.
So far I'm really enjoying the story, so if you haven't already you should check it out.