15 January 2013 9:35 AM, PST | Huffington Post | See recent Huffington Post news »

When "Arrow" (Wednesdays at 8 p.m. Est on The CW) returns with new episodes, Oliver Queen's list of enemies is going to get a lot longer.

Actors from "Fringe," "Battlestar Galactica" and "Spartacus" will be stopping by to play various villains in the next month or two, and in a few weeks, we'll see the first-ever villain team-up on the CW show, along with the return of one of Oliver's most deadly enemies and another run-in with the Huntress.

The roster of good guys will expand as well, with Colton Haynes joining the cast as Roy Harper. He'll start out as a potential love interest for Oliver's sister Thea (wait until you hear how they meet), but he will soon strike up his own important relationship with the hooded avenger. At the end of this post, you'll find not only a list of detailed intel about guest stars, the return »

- Maureen Ryan

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