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Arrow · Season 1 · Episode 21

The Undertaking

Wednesday, May 1 · 42 min · ★ 7.9 on TMDB

Previews and trailers

Official trailer

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 RickardsFelicity SmoakColin SalmonWalter SteeleJohn BarrowmanMalcolm MerlynChin HanFrank ChenRay GallettiDominic AlonzoJamey SheridanRobert QueenSimon BradburyDealerVaughn ClementsArmed GuardAndrew HedgePit BossByron NobleHarold Backman