The episode is to be titled "Disciple." Steve Bacic's character is Green Arrow's mentor, teaching Oliver (Justin Hartley) archery skills, though he don't need them now. Comic book and Green Arrow fans are speculating whether or not this is the same character known as the villain Merlyn the Archer in the DC comic books.
Little note here, if Bacic looks familiar to you, it's because he appeared in the first episode of "Smallville" way back in 2001. Also another note I'm sure there was a news article about Green Arrow in a newspaper back then too, but don't quote me on that!
LEEE777 - Great stuff, I reckon he could be Merlyn, though I hope not because that part was made for Bruce Payne. Still can't wait for this episode.