"Where we left off at the end season two was Slade Wilson was put into Argus — this top security, impossible to escape prison on Lian Yu," Bennett tells The Hollywood Reporter.
Bennett returns to work on the Arrow set next week, and will appear in episode 14 of the season, "The Return," which will air several weeks after the Jan. 21 return of the show.
He can't reveal much about what Slade is up to, but he does offer this tidbit.
"Basically season two ended with him swearing he'd escape, so I imagine that's where they'll pick the storyline up from."
To add to the mystery, executive producer Marc Guggenheim tweeted this Wednesday night after the episode aired.
Marc Guggenheim said:
I probably should mention that the title of Arrow Ep. 3x14 -- "The Return" -- does NOT refer to Oliver. Or Slade Wilson. #speculate