The CW has released information about the November 18th episode of ARROW titled "Brotherhood" which also features Brandon as Ray Palmer who returned to the series in the previous episode called "Lost Souls."
Update: Access Hollywood has a clip from the episode:
“Brotherhood” — (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)
JAMES BAMFORD DIRECTS — Team Green Arrow’s ongoing battle with Damien Darhk (Neal McDonough) is complicated by a shocking revelation. Thea’s (Willa Holland) bloodlust returns and she loses control in front of Alex (guest star Parker Young). James Bamford directed the episode written by Speed Weed & Keto Shimizu (#407). Original airdate 11/18/2015.