The CW has released an official description with spoilers for the Thursday, November 9 episode of Arrow.
The episode is called “Deathstroke Returns” and you can find the write-up below… although oddly, William Franklyn-Miller is listed as the actor playing Joe when we were led to assume it was Liam Hall. An interesting thing we’ll have to check with The CW about. If we were to guess William Franklyn-Miller is the actor playing young Joe in flashbacks.
SLADE RETURNS — Slade (Manu Bennett) returns and asks Oliver (Stephen Amell) for help in tracking down his son. When they learn Joe (guest star William Franklyn-Miller) has been taken hostage by mercenaries, their mission to save him gets complicated by a terrible revelation that could shatter Slade’s hopes of reunion forever. Meanwhile, Vigilante reappears in Star City. Joel Novoa directed the episode written by Ben Sokolowski & Spiro Skentzos (#605). Original airdate 11/9/2017.