14 most tortured heroes and heroines from sci-fi TV

It's not easy being the hero. Everyone expects you to be on your game at all times. If we've learned anything from TV, it's that that never happens. At some point, everyone breaks down.

We've seen more than a few badasses overwhelmed and on the verge of tears. Most of them are running from dark pasts that have molded them into who they are today.

It doesn't matter if you're battling demons, aliens or zombies, it eventually takes its toll. Here are 14 sci-fi heroes who have been through the emotional wringer.