S05E20: Underneath
Oliver and Felicity get trapped in the bunker together, while Diggle and Lyla deal with marital issues.
Previous Episode 
Season 1
Pilot
S1E1 / 10 Oct 2012
Honor Thy Father
S1E2 / 17 Oct 2012
Lone Gunmen
S1E3 / 24 Oct 2012
An Innocent Man
S1E4 / 31 Oct 2012
Damaged
S1E5 / 07 Nov 2012
Legacies
S1E6 / 14 Nov 2012
Muse of Fire
S1E7 / 28 Nov 2012
Vendetta
S1E8 / 05 Dec 2012
Year's End
S1E9 / 12 Dec 2012
Burned
S1E10 / 16 Jan 2013
Trust But Verify
S1E11 / 23 Jan 2013
Vertigo
S1E12 / 30 Jan 2013
Betrayal
S1E13 / 06 Feb 2013
The Odyssey
S1E14 / 13 Feb 2013
Dodger
S1E15 / 20 Feb 2013
Dead to Rights
S1E16 / 27 Feb 2013
The Huntress Returns
S1E17 / 20 Mar 2013
Salvation
S1E18 / 27 Mar 2013
Unfinished Business
S1E19 / 03 Apr 2013
Home Invasion
S1E20 / 24 Apr 2013
The Undertaking
S1E21 / 01 May 2013
Darkness on the Edge of Town
S1E22 / 08 May 2013
Sacrifice
S1E23 / 15 May 2013
Season 2
City of Heroes
S2E1 / 09 Oct 2013
Identity
S2E2 / 16 Oct 2013
Broken Dolls
S2E3 / 23 Oct 2013
Crucible
S2E4 / 30 Oct 2013
League of Assassins
S2E5 / 06 Nov 2013
Keep Your Enemies Closer
S2E6 / 13 Nov 2013
State v. Queen
S2E7 / 20 Nov 2013
The Scientist
S2E8 / 04 Dec 2013
Three Ghosts
S2E9 / 11 Dec 2013
Blast Radius
S2E10 / 15 Jan 2014
Blind Spot
S2E11 / 22 Jan 2014
Tremors
S2E12 / 29 Jan 2014
Heir to the Demon
S2E13 / 05 Feb 2014
Time of Death
S2E14 / 26 Feb 2014
The Promise
S2E15 / 05 Mar 2014
Suicide Squad
S2E16 / 19 Mar 2014
Birds of Prey
S2E17 / 26 Mar 2014
Deathstroke
S2E18 / 02 Apr 2014
The Man Under the Hood
S2E19 / 16 Apr 2014
Seeing Red
S2E20 / 23 Apr 2014
City of Blood
S2E21 / 30 Apr 2014
Streets of Fire
S2E22 / 07 May 2014
Unthinkable
S2E23 / 14 May 2014
Season 3
The Calm
S3E1 / 08 Oct 2014
Sara
S3E2 / 15 Oct 2014
Corto Maltese
S3E3 / 22 Oct 2014
The Magician
S3E4 / 29 Oct 2014
The Secret Origin of Felicity Smoak
S3E5 / 05 Nov 2014
Guilty
S3E6 / 12 Nov 2014
Draw Back Your Bow
S3E7 / 19 Nov 2014
The Brave and the Bold (II)
S3E8 / 03 Dec 2014
The Climb
S3E9 / 10 Dec 2014
Left Behind
S3E10 / 21 Jan 2015
Midnight City
S3E11 / 28 Jan 2015
Uprising
S3E12 / 04 Feb 2015
Canaries
S3E13 / 11 Feb 2015
The Return
S3E14 / 18 Feb 2015
Nanda Parbat
S3E15 / 25 Feb 2015
The Offer
S3E16 / 18 Mar 2015
Suicidal Tendencies
S3E17 / 25 Mar 2015
Public Enemy
S3E18 / 01 Apr 2015
Broken Arrow
S3E19 / 15 Apr 2015
The Fallen
S3E20 / 22 Apr 2015
Al Sah-him
S3E21 / 29 Apr 2015
This is Your Sword
S3E22 / 06 May 2015
My Name Is Oliver Queen
S3E23 / 13 May 2015
Season 4
Green Arrow
S4E1 / 07 Oct 2015
The Candidate
S4E2 / 14 Oct 2015
Restoration
S4E3 / 21 Oct 2015
Beyond Redemption
S4E4 / 28 Oct 2015
Haunted
S4E5 / 04 Nov 2015
Lost Souls
S4E6 / 11 Nov 2015
Brotherhood
S4E7 / 18 Nov 2015
Legends of Yesterday (II)
S4E8 / 02 Dec 2015
Dark Waters
S4E9 / 09 Dec 2015
Blood Debts
S4E10 / 20 Jan 2016
A.W.O.L.
S4E11 / 27 Jan 2016
Unchained
S4E12 / 03 Feb 2016
Sins of the Father
S4E13 / 10 Feb 2016
Code of Silence
S4E14 / 17 Feb 2016
Taken
S4E15 / 24 Feb 2016
Broken Hearts
S4E16 / 23 Mar 2016
Beacon of Hope
S4E17 / 30 Mar 2016
Eleven-Fifty-Nine
S4E18 / 06 Apr 2016
Canary Cry
S4E19 / 27 Apr 2016
Genesis
S4E20 / 04 May 2016
Monument Point
S4E21 / 11 May 2016
Lost in the Flood
S4E22 / 18 May 2016
Schism
S4E23 / 25 May 2016
Season 5
Legacy
S5E1 / 05 Oct 2016
The Recruits
S5E2 / 12 Oct 2016
A Matter of Trust
S5E3 / 19 Oct 2016
Penance
S5E4 / 26 Oct 2016
Human Target
S5E5 / 02 Nov 2016
So It Begins
S5E6 / 09 Nov 2016
Vigilante
S5E7 / 16 Nov 2016
Invasion! (III)
S5E8 / 30 Nov 2016
What We Leave Behind
S5E9 / 07 Dec 2016
Who Are You?
S5E10 / 25 Jan 2017
Second Chances
S5E11 / 01 Feb 2017
Bratva
S5E12 / 08 Feb 2017
Spectre of the Gun
S5E13 / 15 Feb 2017
The Sin-Eater
S5E14 / 22 Feb 2017
Fighting Fire with Fire
S5E15 / 01 Mar 2017
Checkmate
S5E16 / 15 Mar 2017
Kapiushon
S5E17 / 22 Mar 2017
Disbanded
S5E18 / 29 Mar 2017
Dangerous Liaisons
S5E19 / 26 Apr 2017
Underneath
S5E20 / 03 May 2017
Honor Thy Fathers
S5E21 / 10 May 2017
Missing
S5E22 / 17 May 2017
Lian Yu
S5E23 / 24 May 2017
Season 6
Fallout
S6E1 / 12 Oct 2017
Tribute
S6E2 / 19 Oct 2017
Next of Kin
S6E3 / 26 Oct 2017
Reversal
S6E4 / 02 Nov 2017
Deathstroke Returns
S6E5 / 09 Nov 2017
Promises Kept
S6E6 / 16 Nov 2017
Thanksgiving
S6E7 / 23 Nov 2017
Crisis on Earth-X (II)
S6E8 / 27 Nov 2017
Irreconcilable Differences
S6E9 / 07 Dec 2017
Divided
S6E10 / 18 Jan 2018
We Fall
S6E11 / 25 Jan 2018
All for Nothing
S6E12 / 01 Feb 2018
The Devil's Greatest Trick
S6E13 / 08 Feb 2018
Collision Course
S6E14 / 01 Mar 2018
Doppelganger
S6E15 / 08 Mar 2018
The Thanatos Guild
S6E16 / 29 Mar 2018
Brothers in Arms
S6E17 / 05 Apr 2018
Fundamentals
S6E18 / 12 Apr 2018
The Dragon
S6E19 / 19 Apr 2018
Shifting Allegiances
S6E20 / 26 Apr 2018
Docket No. 11-19-41-73
S6E21 / 03 May 2018
The Ties That Bind
S6E22 / 10 May 2018
Life Sentence
S6E23 / 17 May 2018
Season 7
Inmate 4587
S7E1 / 15 Oct 2018
The Longbow Hunters
S7E2 / 22 Oct 2018
Crossing Lines
S7E3 / 29 Oct 2018
Level Two
S7E4 / 05 Nov 2018
The Demon
S7E5 / 12 Nov 2018
Due Process
S7E6 / 19 Nov 2018
The Slabside Redemption
S7E7 / 26 Nov 2018
Unmasked
S7E8 / 03 Dec 2018
Elseworlds (II)
S7E9 / 10 Dec 2018
My Name Is Emiko Queen
S7E10 / 21 Jan 2019
Past Sins
S7E11 / 28 Jan 2019
Emerald Archer
S7E12 / 04 Feb 2019
Star City Slayer
S7E13 / 11 Feb 2019
Brothers & Sisters
S7E14 / 04 Mar 2019
Training Day
S7E15 / 11 Mar 2019
Star City 2040
S7E16 / 18 Mar 2019
Inheritance
S7E17 / 25 Mar 2019
Lost Canary
S7E18 / 15 Apr 2019
Spartan
S7E19 / 22 Apr 2019
Confessions
S7E20 / 29 Apr 2019
Living Proof
S7E21 / 06 May 2019
You Have Saved This City
S7E22 / 13 May 2019
Season 8
Starling City
S8E1 / 15 Oct 2019
Welcome to Hong Kong
S8E2 / 22 Oct 2019
Leap of Faith
S8E3 / 29 Oct 2019
Present Tense
S8E4 / 05 Nov 2019
Prochnost
S8E5 / 19 Nov 2019
Reset
S8E6 / 26 Nov 2019
Purgatory
S8E7 / 03 Dec 2019
Crisis on Infinite Earths: Part Four (IV)
S8E8 / 14 Jan 2020
Green Arrow & The Canaries
S8E9 / 21 Jan 2020
Fadeout
S8E10 / 28 Jan 2020
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
