In the season four premiere, Oliver and Felicity must return home to help the team against attacks by "ghost" assassins led by Damien Darhk (NEAL McDONOUGH).
Oliver returns as The Green Arrow in the season 4 premiere.
Oliver & Thea protect a family friend running for mayor.
Laurel (KATIE CASSIDY) takes her sister to Nanda Parbat.
Laurel deals with the aftermath of Nanda Parbat.
MATT RYAN reprises his role as John Constantine.
Ray Palmer (BRANDON ROUTH) returns from the dead.
Thea's bloodlust returns in front of Alex (PARKER YOUNG).
The epic crossover event with The Flash continues.
Oliver takes on HIVE…and Damien Darhk retaliates.
Oliver seeks revenge for Darhk's last attack.
Diggle and his brother take on Shadowspire.
Roy Harper (COLTON HAYNES) returns to Star City.
Nyssa (KATRINA LAW) makes an offer that's hard to refuse.
Team Arrow prepares for an attack from HIVE.
Vixen (MEGALYN E.K.) joins Team Arrow.
Cupid returns to wreak havoc on Star City.
Brie Larvan (EMILY KINNEY) sets her sights on Felicity.
Merlyn plans on breaking Darhk out of prison.
Oliver and the team struggle with Laurel's death.
Consumed with guilt, Diggle seeks revenge against Andy.
Team Arrow enlists Noah Kuttler to help againt Darhk.
Oliver fights for Thea; Donna Smoak faces off with Noah.
Oliver teams up to stop Darhk in the season four finale.