The Walking Dead
I don't know how I lived without this show. It is the perfect show for me. A guy wakes up from a coma in a post zombie apocalyptic world and has no idea what the hell is going on. Now, 2 series and 6 episodes in, they're almost a year post-zombies and still fighting for their lives. This series is really captivating and each episode seems to always end on a cliffhanger and leave you wanting more. Each episode never fails to have you gripping your blanket or sitting on the edge of your seat in fear of zombies jumping out at the characters. I've read up to vol. 6 of the comics too and love them almost as much.
This is the only other criminal investigation show I watch, and I love how science based it is (even though a lot of the 'science' - as with NCIS, is in fact bollocks). Booth and Bones are a perfect crime solving team and I love watching the tension between them (obviously I'm a sucker for romance. I've only seen to the end of season 6, and I know there's a baby a-commin! I just need to find the next season(s) somewhere for cheap!). I wish Australian television wouldn't muck around so much with Bones... I had to stop watching because they kept putting repeats on and I found it so hard to keep up.