Garrett Black

Oliver decides it's time for Thea to return home to Starling City, so he packs for Corto Maltese, where Felicity has traced Thea's whereabouts. Lyla (guest star Audrey Marie Anderson) asks Diggle to go with Oliver because one of her field operatives, Mark Shaw (guest star David Cubitt), has gone dark in Corto Maltese and she'd like him to look into it. Feeling responsible for Thea's departure, Roy joins Oliver and Diggle on their journey. Shaw double-crosses Diggle, putting numerous A.R.G.U.S. agents, including Lyla, at risk. Meanwhile, Laurel meets Ted Grant (recurring guest star J.R. Ramirez), and Felicity adjusts to her new job.

In a flashback, Will Scarlet and Anastasia jump through the looking glass to enter Wonderland against her mother's wishes. They both soon realise that life in Wonderland isn't exactly what they had both imagined.

A key witness in a drug investigation is found dead after escaping from his court-mandated rehab programme, and Backstrom must figure out how he escaped and who killed him.