Like the person above me said - yes, he is evil, but there is an AU version of him running around too, who is being blackmailed into doing bad things but is actually a good guy. So I'm not sure which of them you saw, because it could've been either one, but one is a decent person and one is not.
The storyline with the AU doppelganger was actually my favorite thing about the show. If you'd like to just watch that story arc, I suggest starting with 2x04. All you really need for purposes of the story arc are the last couple minutes of the episode, so you could also skip right to the end, watch that scene, and then go on to 2x05 if you like. It sucked me in HARD within a couple of episodes after I'd bounced off the first season, so I think it's worth giving a try! :D
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The storyline with the AU doppelganger was actually my favorite thing about the show. If you'd like to just watch that story arc, I suggest starting with 2x04. All you really need for purposes of the story arc are the last couple minutes of the episode, so you could also skip right to the end, watch that scene, and then go on to 2x05 if you like. It sucked me in HARD within a couple of episodes after I'd bounced off the first season, so I think it's worth giving a try! :D