Arrow - Season 1 - Eps 21: The Undertaking
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.
About Arrow

Title: Arrow
First Air Date: 2012-10-10
Last Air Date: 2020-01-28
Status: Ended
Rating: 6.8/10 (from 6030 votes)
Language: EN
Seasons: 9
Total Episodes: 170
Network: The CW
Genres: Crime, Drama, Action & Adventure
Production Companies: Berlanti Productions, DC Entertainment, Warner Bros. Television
Synopsis
Spoiled billionaire playboy Oliver Queen is missing and presumed dead when his yacht is lost at sea. He returns five years later a changed man, determined to clean up the city as a hooded vigilante armed with a bow.
Cast

Stephen Amell
Oliver Queen / Green Arrow

Rick Gonzalez
Rene Ramirez / Wild Dog

Katherine McNamara
Mia Smoak / Blackstar

David Ramsey
John Diggle / Spartan

Katie Cassidy
Laurel Lance / Black Canary

Juliana Harkavy
Dinah Drake / Black Canary

Joseph David-Jones
Connor Hawke

Ben Lewis
Adult William Clayton