The CW has released a very short official description for the January 20 return episode of Arrow, titled “Blood Debts.”
Here’s the write-up:
THE AFTERMATH — Oliver (Stephen Amell) must deal with the devastating consequences of Darhk’s (guest star Neal McDonough) last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Dahrk. Jesse Warn directed the episode written by Oscar Balderrama & Sarah Tarkoff (#410). Original airdate 1/20/2016.