S06E17: Valhalla
After a series of murders, Prentiss becomes suspicious of a former nemesis, and fears for the safety of her team.
Previous Episode 
Season 1
Extreme Aggressor
S1E1 / 22 Sep 2005
Compulsion
S1E2 / 28 Sep 2005
Won't Get Fooled Again
S1E3 / 05 Oct 2005
Plain Sight
S1E4 / 12 Oct 2005
Broken Mirror
S1E5 / 19 Oct 2005
L.D.S.K.
S1E6 / 02 Nov 2005
The Fox
S1E7 / 09 Nov 2005
Natural Born Killer
S1E8 / 16 Nov 2005
Derailed
S1E9 / 23 Nov 2005
The Popular Kids
S1E10 / 30 Nov 2005
Blood Hungry
S1E11 / 14 Dec 2005
What Fresh Hell?
S1E12 / 11 Jan 2006
Poison
S1E13 / 18 Jan 2006
Riding the Lightning
S1E14 / 25 Jan 2006
Unfinished Business
S1E15 / 01 Mar 2006
The Tribe
S1E16 / 08 Mar 2006
A Real Rain
S1E17 / 22 Mar 2006
Somebody's Watching
S1E18 / 29 Mar 2006
Machismo
S1E19 / 12 Apr 2006
Charm and Harm
S1E20 / 19 Apr 2006
Secrets and Lies
S1E21 / 03 May 2006
The Fisher King (1)
S1E22 / 10 May 2006
Season 2
The Fisher King (2)
S2E1 / 20 Sep 2006
P911
S2E2 / 27 Sep 2006
The Perfect Storm
S2E3 / 04 Oct 2006
Psychodrama
S2E4 / 11 Oct 2006
Aftermath
S2E5 / 18 Oct 2006
The Boogeyman
S2E6 / 25 Oct 2006
North Mammon
S2E7 / 01 Nov 2006
Empty Planet
S2E8 / 08 Nov 2006
The Last Word
S2E9 / 15 Nov 2006
Lessons Learned
S2E10 / 22 Nov 2006
Sex, Birth, Death
S2E11 / 29 Nov 2006
Profiler, Profiled
S2E12 / 13 Dec 2006
No Way Out (1)
S2E13 / 17 Jan 2007
The Big Game (1)
S2E14 / 04 Feb 2007
Revelations (2)
S2E15 / 07 Feb 2007
Fear and Loathing
S2E16 / 14 Feb 2007
Distress
S2E17 / 21 Feb 2007
Jones
S2E18 / 28 Feb 2007
Ashes and Dust
S2E19 / 21 Mar 2007
Honor Among Thieves
S2E20 / 11 Apr 2007
Open Season
S2E21 / 02 May 2007
Legacy
S2E22 / 09 May 2007
No Way Out: The Evilution of Frank (2)
S2E23 / 16 May 2007
Season 3
Doubt
S3E1 / 26 Sep 2007
In Name and Blood
S3E2 / 03 Oct 2007
Scared to Death
S3E3 / 10 Oct 2007
Children of the Dark
S3E4 / 17 Oct 2007
Seven Seconds
S3E5 / 24 Oct 2007
About Face
S3E6 / 31 Oct 2007
Identity
S3E7 / 07 Nov 2007
Lucky
S3E8 / 14 Nov 2007
Penelope
S3E9 / 21 Nov 2007
True Night
S3E10 / 28 Nov 2007
Birthright
S3E11 / 12 Dec 2007
3rd Life
S3E12 / 09 Jan 2008
Limelight
S3E13 / 23 Jan 2008
Damaged
S3E14 / 02 Apr 2008
A Higher Power
S3E15 / 09 Apr 2008
Elephant's Memory
S3E16 / 16 Apr 2008
In Heat
S3E17 / 30 Apr 2008
The Crossing
S3E18 / 07 May 2008
Tabula Rasa
S3E19 / 14 May 2008
Lo-Fi
S3E20 / 21 May 2008
Season 4
Mayhem
S4E1 / 24 Sep 2008
The Angel Maker
S4E2 / 01 Oct 2008
Minimal Loss
S4E3 / 08 Oct 2008
Paradise
S4E4 / 22 Oct 2008
Catching Out
S4E5 / 29 Oct 2008
The Instincts
S4E6 / 05 Nov 2008
Memoriam
S4E7 / 12 Nov 2008
Masterpiece
S4E8 / 19 Nov 2008
52 Pickup
S4E9 / 26 Nov 2008
Brothers in Arms
S4E10 / 10 Dec 2008
Normal
S4E11 / 17 Dec 2008
Soul Mates
S4E12 / 14 Jan 2009
Bloodline
S4E13 / 21 Jan 2009
Cold Comfort
S4E14 / 11 Feb 2009
Zoe's Reprise
S4E15 / 18 Feb 2009
Pleasure Is My Business
S4E16 / 25 Feb 2009
Demonology
S4E17 / 11 Mar 2009
Omnivore
S4E18 / 18 Mar 2009
House on Fire
S4E19 / 25 Mar 2009
Conflicted
S4E20 / 08 Apr 2009
A Shade of Gray
S4E21 / 22 Apr 2009
The Big Wheel
S4E22 / 29 Apr 2009
Roadkill
S4E23 / 06 May 2009
Amplification
S4E24 / 13 May 2009
To Hell... (1)
S4E25 / 20 May 2009
...And Back (2)
S4E26 / 20 May 2009
Season 5
Nameless, Faceless
S5E1 / 23 Sep 2009
Haunted
S5E2 / 30 Sep 2009
Reckoner
S5E3 / 07 Oct 2009
Hopeless
S5E4 / 14 Oct 2009
Cradle to Grave
S5E5 / 21 Oct 2009
The Eyes Have It
S5E6 / 04 Nov 2009
The Performer
S5E7 / 11 Nov 2009
Outfoxed
S5E8 / 18 Nov 2009
100
S5E9 / 25 Nov 2009
The Slave of Duty
S5E10 / 09 Dec 2009
Retaliation
S5E11 / 16 Dec 2009
The Uncanny Valley
S5E12 / 13 Jan 2010
Risky Business
S5E13 / 20 Jan 2010
Parasite
S5E14 / 03 Feb 2010
Public Enemy
S5E15 / 10 Feb 2010
Mosley Lane
S5E16 / 03 Mar 2010
Solitary Man
S5E17 / 10 Mar 2010
The Fight
S5E18 / 07 Apr 2010
Rite of Passage
S5E19 / 14 Apr 2010
...A Thousand Words
S5E20 / 05 May 2010
Exit Wounds
S5E21 / 12 May 2010
The Internet Is Forever
S5E22 / 19 May 2010
Our Darkest Hour
S5E23 / 26 May 2010
Season 6
The Longest Night
S6E1 / 22 Sep 2010
JJ
S6E2 / 29 Sep 2010
Remembrance of Things Past
S6E3 / 06 Oct 2010
Compromising Positions
S6E4 / 13 Oct 2010
Safe Haven
S6E5 / 20 Oct 2010
Devil's Night
S6E6 / 27 Oct 2010
Middle Man
S6E7 / 03 Nov 2010
Reflection of Desire
S6E8 / 10 Nov 2010
Into the Woods
S6E9 / 17 Nov 2010
What Happens at Home...
S6E10 / 08 Dec 2010
25 to Life
S6E11 / 15 Dec 2010
Corazon
S6E12 / 19 Jan 2011
The Thirteenth Step
S6E13 / 26 Jan 2011
Sense Memory
S6E14 / 09 Feb 2011
Today I Do
S6E15 / 16 Feb 2011
Coda
S6E16 / 23 Feb 2011
Valhalla
S6E17 / 02 Mar 2011
Lauren
S6E18 / 16 Mar 2011
With Friends Like These...
S6E19 / 30 Mar 2011
Hanley Waters
S6E20 / 06 Apr 2011
The Stranger
S6E21 / 13 Apr 2011
Out of the Light
S6E22 / 04 May 2011
Big Sea
S6E23 / 11 May 2011
Supply and Demand
S6E24 / 18 May 2011
Season 7
It Takes a Village
S7E1 / 21 Sep 2011
Proof
S7E2 / 28 Sep 2011
Dorado Falls
S7E3 / 05 Oct 2011
Painless
S7E4 / 12 Oct 2011
From Childhood's Hour
S7E5 / 19 Oct 2011
Epilogue
S7E6 / 02 Nov 2011
There's No Place Like Home
S7E7 / 09 Nov 2011
Hope
S7E8 / 16 Nov 2011
Self-Fulfilling Prophecy
S7E9 / 07 Dec 2011
The Bittersweet Science
S7E10 / 14 Dec 2011
True Genius
S7E11 / 18 Jan 2012
Unknown Subject
S7E12 / 25 Jan 2012
Snake Eyes
S7E13 / 08 Feb 2012
Closing Time
S7E14 / 15 Feb 2012
A Thin Line
S7E15 / 22 Feb 2012
A Family Affair
S7E16 / 29 Feb 2012
I Love You, Tommy Brown
S7E17 / 14 Mar 2012
Foundation
S7E18 / 21 Mar 2012
Heathridge Manor
S7E19 / 04 Apr 2012
The Company
S7E20 / 11 Apr 2012
Divining Rod
S7E21 / 02 May 2012
Profiling 101
S7E22 / 09 May 2012
Hit (1)
S7E23 / 16 May 2012
Run (2)
S7E24 / 16 May 2012
Season 8
The Silencer
S8E1 / 26 Sep 2012
The Pact
S8E2 / 10 Oct 2012
Through the Looking Glass
S8E3 / 17 Oct 2012
God Complex
S8E4 / 24 Oct 2012
The Good Earth
S8E5 / 31 Oct 2012
The Apprenticeship
S8E6 / 07 Nov 2012
The Fallen
S8E7 / 14 Nov 2012
The Wheels on the Bus...
S8E8 / 21 Nov 2012
Magnificent Light
S8E9 / 28 Nov 2012
The Lesson
S8E10 / 05 Dec 2012
Perennials
S8E11 / 12 Dec 2012
Zugzwang
S8E12 / 16 Jan 2013
Magnum Opus
S8E13 / 23 Jan 2013
All That Remains
S8E14 / 06 Feb 2013
Broken
S8E15 / 20 Feb 2013
Carbon Copy
S8E16 / 27 Feb 2013
The Gathering
S8E17 / 20 Mar 2013
Restoration
S8E18 / 03 Apr 2013
Pay It Forward
S8E19 / 10 Apr 2013
Alchemy
S8E20 / 01 May 2013
Nanny Dearest
S8E21 / 08 May 2013
Number Six
S8E22 / 15 May 2013
Brothers Hotchner (1)
S8E23 / 22 May 2013
The Replicator (2)
S8E24 / 22 May 2013
Season 9
The Inspiration (1)
S9E1 / 25 Sep 2013
The Inspired (2)
S9E2 / 02 Oct 2013
Final Shot
S9E3 / 09 Oct 2013
To Bear Witness
S9E4 / 16 Oct 2013
Route 66
S9E5 / 23 Oct 2013
In the Blood
S9E6 / 30 Oct 2013
Gatekeeper
S9E7 / 06 Nov 2013
The Return
S9E8 / 13 Nov 2013
Strange Fruit
S9E9 / 20 Nov 2013
The Caller
S9E10 / 27 Nov 2013
Bully
S9E11 / 11 Dec 2013
The Black Queen
S9E12 / 15 Jan 2014
The Road Home (1)
S9E13 / 22 Jan 2014
200 (2)
S9E14 / 05 Feb 2014
Mr. & Mrs. Anderson
S9E15 / 19 Feb 2014
Gabby
S9E16 / 26 Feb 2014
Persuasion
S9E17 / 05 Mar 2014
Rabid
S9E18 / 12 Mar 2014
The Edge of Winter
S9E19 / 19 Mar 2014
Blood Relations
S9E20 / 02 Apr 2014
What Happens in Mecklinburg...
S9E21 / 09 Apr 2014
Fatal
S9E22 / 30 Apr 2014
Angels (1)
S9E23 / 07 May 2014
Demons (2)
S9E24 / 14 May 2014
Season 10
X
S10E1 / 01 Oct 2014
Burn
S10E2 / 08 Oct 2014
A Thousand Suns
S10E3 / 15 Oct 2014
The Itch
S10E4 / 22 Oct 2014
Boxed In
S10E5 / 29 Oct 2014
If the Shoe Fits
S10E6 / 05 Nov 2014
Hashtag
S10E7 / 12 Nov 2014
The Boys of Sudworth Place
S10E8 / 19 Nov 2014
Fate
S10E9 / 26 Nov 2014
Amelia Porter
S10E10 / 10 Dec 2014
The Forever People
S10E11 / 14 Jan 2015
Anonymous
S10E12 / 21 Jan 2015
Nelson's Sparrow
S10E13 / 28 Jan 2015
Hero Worship
S10E14 / 04 Feb 2015
Scream
S10E15 / 11 Feb 2015
Lockdown
S10E16 / 04 Mar 2015
Breath Play
S10E17 / 11 Mar 2015
Rock Creek Park
S10E18 / 25 Mar 2015
Beyond Borders
S10E19 / 08 Apr 2015
A Place at the Table
S10E20 / 15 Apr 2015
Mr. Scratch
S10E21 / 22 Apr 2015
Protection
S10E22 / 29 Apr 2015
The Hunt
S10E23 / 06 May 2015
Season 11
The Job
S11E1 / 30 Sep 2015
The Witness
S11E2 / 07 Oct 2015
'Til Death Do Us Part
S11E3 / 14 Oct 2015
Outlaw
S11E4 / 21 Oct 2015
The Night Watch
S11E5 / 28 Oct 2015
Pariahville
S11E6 / 04 Nov 2015
Target Rich
S11E7 / 11 Nov 2015
Awake
S11E8 / 18 Nov 2015
Internal Affairs
S11E9 / 02 Dec 2015
Future Perfect
S11E10 / 09 Dec 2015
Entropy
S11E11 / 13 Jan 2016
Drive
S11E12 / 20 Jan 2016
The Bond
S11E13 / 27 Jan 2016
Hostage
S11E14 / 10 Feb 2016
A Badge and a Gun
S11E15 / 24 Feb 2016
Derek
S11E16 / 02 Mar 2016
The Sandman
S11E17 / 16 Mar 2016
A Beautiful Disaster
S11E18 / 23 Mar 2016
Tribute
S11E19 / 30 Mar 2016
Inner Beauty
S11E20 / 13 Apr 2016
Devil's Backbone
S11E21 / 20 Apr 2016
The Storm
S11E22 / 04 May 2016
Season 12
The Crimson King
S12E1 / 28 Sep 2016
Sick Day
S12E2 / 05 Oct 2016
Taboo
S12E3 / 12 Oct 2016
Keeper
S12E4 / 26 Oct 2016
The Anti-Terrorism Squad
S12E5 / 09 Nov 2016
Elliott's Pond
S12E6 / 16 Nov 2016
Mirror Image
S12E7 / 30 Nov 2016
Scarecrow
S12E8 / 07 Dec 2016
Profiling 202
S12E9 / 04 Jan 2017
Seek and Destroy
S12E10 / 11 Jan 2017
Surface Tension
S12E11 / 01 Feb 2017
A Good Husband
S12E12 / 08 Feb 2017
Spencer
S12E13 / 15 Feb 2017
Collision Course
S12E14 / 22 Feb 2017
Alpha Male
S12E15 / 01 Mar 2017
Assistance Is Futile
S12E16 / 15 Mar 2017
In the Dark
S12E17 / 22 Mar 2017
Hell's Kitchen
S12E18 / 29 Mar 2017
True North
S12E19 / 05 Apr 2017
Unforgettable
S12E20 / 26 Apr 2017
Green Light
S12E21 / 03 May 2017
Red Light
S12E22 / 10 May 2017
Season 13
Wheels Up
S13E1 / 27 Sep 2017
To a Better Place
S13E2 / 04 Oct 2017
Blue Angel
S13E3 / 11 Oct 2017
Killer App
S13E4 / 18 Oct 2017
Lucky Strikes
S13E5 / 25 Oct 2017
The Bunker
S13E6 / 08 Nov 2017
Dust and Bones
S13E7 / 15 Nov 2017
Neon Terror
S13E8 / 22 Nov 2017
False Flag
S13E9 / 06 Dec 2017
Submerged
S13E10 / 03 Jan 2018
Full-Tilt Boogie
S13E11 / 10 Jan 2018
Bad Moon on the Rise
S13E12 / 17 Jan 2018
Cure
S13E13 / 24 Jan 2018
Miasma
S13E14 / 31 Jan 2018
Annihilator
S13E15 / 07 Mar 2018
Last Gasp
S13E16 / 14 Mar 2018
The Capilanos
S13E17 / 21 Mar 2018
The Dance of Love
S13E18 / 28 Mar 2018
Ex Parte
S13E19 / 04 Apr 2018
All You Can Eat
S13E20 / 11 Apr 2018
Mixed Signals
S13E21 / 18 Apr 2018
Believer
S13E22 / 18 Apr 2018
Season 14
300
S14E1 / 03 Oct 2018
Starter Home
S14E2 / 10 Oct 2018
Rule 34
S14E3 / 17 Oct 2018
Innocence
S14E4 / 24 Oct 2018
The Tall Man
S14E5 / 31 Oct 2018
Luke
S14E6 / 07 Nov 2018
Twenty Seven
S14E7 / 14 Nov 2018
Ashley
S14E8 / 21 Nov 2018
Broken Wing
S14E9 / 05 Dec 2018
Flesh and Blood
S14E10 / 12 Dec 2018
Night Lights
S14E11 / 02 Jan 2019
Hamelin
S14E12 / 09 Jan 2019
Chameleon
S14E13 / 23 Jan 2019
Sick and Evil
S14E14 / 30 Jan 2019
Truth or Dare
S14E15 / 06 Feb 2019
Season 15
Under the Skin
S15E1 / 08 Jan 2020
Awakenings
S15E2 / 08 Jan 2020
Spectator Slowing
S15E3 / 15 Jan 2020
Saturday
S15E4 / 22 Jan 2020
Ghost
S15E5 / 29 Jan 2020
Date Night
S15E6 / 05 Feb 2020
Rusty
S15E7 / 05 Feb 2020
Family Tree
S15E8 / 12 Feb 2020
Face Off (1)
S15E9 / 19 Feb 2020
And in the End (2)
S15E10 / 19 Feb 2020
Season 16
Just Getting Started
S16E1 / 24 Nov 2022
Sicarius
S16E2 / 24 Nov 2022
Moose
S16E3 / 01 Dec 2022
Pay-Per-View
S16E4 / 08 Dec 2022
Oedipus Wrecks
S16E5 / 15 Dec 2022
True Conviction
S16E6 / 12 Jan 2023
What Doesn’t Kill Us
S16E7 / 19 Jan 2023
Forget Me Knots
S16E8 / 26 Jan 2023
Memento Mori
S16E9 / 02 Feb 2023
Dead End
S16E10 / 09 Feb 2023
Season 17
Gold Star
S17E1 / 06 Jun 2024
Contagion
S17E2 / 06 Jun 2024
Homesick
S17E3 / 13 Jun 2024
Kingdom of the Blind
S17E4 / 20 Jun 2024
Conspiracy vs. Theory
S17E5 / 27 Jun 2024
Message in a Bottle
S17E6 / 04 Jul 2024
Piranha
S17E7 / 11 Jul 2024
North Star
S17E8 / 18 Jul 2024
Stars & Stripes
S17E9 / 25 Jul 2024
Save the Children
S17E10 / 01 Aug 2024
Season 18
Swimmer's Calculus
S18E1 / 08 May 2025
The Zookeeper
S18E2 / 15 May 2025
Time to Say Goodbye
S18E3 / 22 May 2025
I'm Fine, It's Fine. Everything Is Fine
S18E4 / 29 May 2025
The Brutal Man
S18E5 / 05 Jun 2025
Hell Is Empty…
S18E6 / 12 Jun 2025
…All the Devils are Here
S18E7 / 19 Jun 2025
Tara
S18E8 / 26 Jun 2025
CollateRal
S18E9 / 03 Jul 2025
The Disciple
S18E10 / 10 Jul 2025
Season 19
Now and Then
S19E1 / 28 May 2026
Cluster
S19E2 / 28 May 2026
Body Count
S19E3 / 04 Jun 2026
The Witching Hour
S19E4 / 11 Jun 2026
Friendly Fire
S19E5 / 18 Jun 2026
Proxy
S19E6 / 25 Jun 2026
The Furies
S19E7 / 02 Jul 2026
Requiem
S19E8 / 09 Jul 2026
Special Agent Garrity
S19E9 / 16 Jul 2026
Bad Blood
S19E10 / 23 Jul 2026
Joe Mantegna
David Rossi
Paget Brewster
Emily Prentiss
Adam Rodriguez
Luke Alvez
Kirsten Vangsness
Penelope Garcia
A.J. Cook
Jennifer Jareau
Aisha Tyler
Dr. Tara Lewis
Zach Gilford
Elias Voit
