The premiere episode of this new NBC series, based on a DC Comics character, was a dreary mess. Last week’s follow-up episode was an obvious reboot, trying to inject a lighter, Elementary-type flavor by pairing him with an evil-hunting partner, Zed, played by Anjelica Celaya. Didn’t help. So tonight, for episode three, what’s left to try? I know: Giving up and changing the channel.