In last week’s “Arrow,” Malcolm Merlyn (John Barrowman) tasked Oliver (Stephen Amell) and Thea Queen (Willa Holland) with conquering their fears in order to face Ra’s al Ghul (Matt Nable) and his deadly League of Assassins, sending them to the island of Lian Yu.

The desolate landscape that forged Oliver into the show’s titular hero is now used by ARGUS as a supermax prison for The Arrow’s most dangerous foes — among them, Slade Wilson, aka Deathstroke (Manu Bennett), the man responsible for murdering Oliver and Thea’s mother. In Variety‘s exclusive preview of the Feb. 18 episode, aptly titled “The Return,” the duo come face to face with their old enemy, and it’s safe to say that it’s not a particularly friendly reunion.

Elsewhere in the hour, a flashback takes us back to when Oliver and Maseo (guest star Karl Yune) returned to Starling City to retrieve the Omega bio weapon, and despite being under strict orders from Amanda Waller (guest star Cynthia Addai-Robinson) not to reveal himself to anyone, Oliver looks in on his family, Laurel (Katie Cassidy) and Tommy (guest star Colin Donnell). Dermott Downs directed the episode written by Marc Guggenheim and Erik Oleson.

“Arrow” airs Wednesdays at 8 p.m. on The CW.