In "Blood Debts," the midseason premiere of "Arrow," Oliver is on a hunt for vengeance against Damien Darhk for what he did to Felicity -- but it looks like Darhk won't be the only villain Team Arrow encounters in the episode.
Executive producer Marc Guggenheim Tweeted a comic preview for "Arrow's" impending return, which teases the return of Anarky (Alexander Calvert). Anarky first appeared in Darhk's employ, only to be released when he proved to be too volatile, and he may or may not be looking to exact a little revenge of his own.
According to the episode's official description, "Oliver (Stephen Amell) must deal with the devastating consequences of Darhk's (guest star Neal McDonough) last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Dahrk."