Starling City

Oliver returns to Starling City on Earth-2, where he encounters familiar faces while trying to decipher the Monitor's mission. Meanwhile, Mia and William's team clash with a new foe.

Susanna Thompson

Moira Queen

Colin Donnell

Tommy Merlyn

Josh Segarra

Adrian Chase

John Barrowman

Malcolm Merlyn

Andrea Sixtos

Adult Zoe Ramirez

LaMonica Garrett

Mar Novu / The Monitor

Hugo Ateo

Alberto Vazquez

Tegan Verheul

Not Felicity

Charlie Barnett

John 'JJ' Diggle, Jr.