In no particular order. Most are available on Netflix and/or Hulu.
1. The Walking Dead - Fantastic, probably one of my favorites on the list. Zombie apocalypse and whatnot.
2. Heroes - Ok, the after the first season and a half or so it gets pretty stuffty - but up until then, it's incredible! People with superpowers, as the title indicates.
3. House MD - Not much to say here. Another favorite up along with TWD, except this has a more comedic spin to it (it's half drama, half comedy). Also, less zombies. Still a great one, maybe even better than TWD.
4. Breaking Bad - Teacher turned drug dealer. Fantastic show.
5. Game of Thrones - Also a good show. Not actually one of my favorites, but it's still pretty epic.
That's all for now folks!