DES..?.? OK,, so I'm way off. Sounds even better that way. From the past. maybe was part of a secret Nazi research project, and as he's been alive this whole time it's become his passion/mission to save humanity from what he thinks is coming.
AWESOME! Yea, he wondered why he can't die, and weird things keep attacking the planet, and only they notice. The first epi one of the team got a little power hungry and was trying to power up a weapon (a metallic hand) by killing people with it. She ended up shooting herself, and he put the hand in a vault and sealed it shut.
She wanted cool experiences from whatever's out there and all they get are the violent phenomenas to deal with.