“Next of Kin” is the title of the Thursday, October 26 episode of Arrow and The CW has released an official description with some spoilers — including the reveal that the character Onyx is coming to the show!
DC CHARACTER ONYX VISITS STAR CITY — A rogue black ops team led by Onyx (guest star Chastity Dotson) breaks into Kord Industries and steals something lethal. Oliver (Stephen Amell) struggles to connect with William (guest star Jack Moore) so he reaches out to a surprising source for help. Kevin Tancharoen directed the episode written by Speed Weed & Oscar Balderrama (#603). Original airdate 10/26/2017.