The Undertaking

Summary

Finding it difficult to mend fences with Tommy and Diggle, Oliver instead focuses on crossing another name off the list. While digging through a crooked accountant's laptop, Felicity discovers a transaction that could help Oliver find Walter. To reconfirm the lead, Oliver gambles that Felicity can be counted on in the field for the first time. In a flashback, Malcolm reveals to Robert Queen and Frank Chen painful details surrounding his wife's murder, and how that shaped his plans for the Glades. Meanwhile, Tommy stuns Laurel with the truth.

Guest stars

• Emily Bett Rickards as Felicity Smoak
• Colin Salmon as Walter Steele
• John Barrowman as Malcolm Merlyn
• Chin Han as Frank Chen
• Ray Galletti as Dominic Alonzo
• Jamey Sheridan as Robert Queen
• Simon Bradbury as Dealer
• Vaughn Clements as Armed Guard
• Andrew Hedge as Pit Boss
• Byron Noble as Harold Backman