Oliver Queen's mentor comes to Smallville (Metropolis) to show us how Green Arrow learned archery. People believe that the name 'The Dark Archer' is a code name for Merlyn, Green Arrow's mentor and later nemesis in the DC universe.
This episoode seems to be a Green Arrow themed episode, seeing that Mia Darde(Speedy) returns in this episode to most likely do absolutely nothing. Hopefully she'll at least hold an arrow and maybe even a bow. Maybe the Dark Archer comes to teach Mia, then goes rogue and shoots up some people medieval style.
Watch
Smallville January 22, 2010 on The CW to see just what happens.