I am currently watching Torchwood as I write this. It is a British science fiction spin off of Doctor Who(great show). Torchwood is based off a small group of Alien-Hunters who are defending and arming the earth. The main Character is Captain Jack Harkness (John Barrow man), an immortal ex-con from the future who has lived on earth for hundreds of years.
So far the show is great, I am a big fan of Doctor Who and this show suits my tastes. If you love Doctor Who I recommend giving this show a shot. It's exciting and funny at times, I cant stop watching. I'm currently ten episodes in and watching it on netflix.