S04E20: Worlds Apart
The teams on both sides fight on for a common cause, and there are shocking developments tied to the Cortexiphan children.
Previous Episode 
Season 1
Pilot
S1E1 / 09 Sep 2008
The Same Old Story
S1E2 / 16 Sep 2008
The Ghost Network
S1E3 / 23 Sep 2008
The Arrival
S1E4 / 30 Sep 2008
Power Hungry
S1E5 / 14 Oct 2008
The Cure
S1E6 / 21 Oct 2008
In Which We Meet Mr. Jones
S1E7 / 11 Nov 2008
The Equation
S1E8 / 18 Nov 2008
The Dreamscape
S1E9 / 25 Nov 2008
Safe
S1E10 / 02 Dec 2008
Bound
S1E11 / 20 Jan 2009
The No-Brainer
S1E12 / 27 Jan 2009
The Transformation
S1E13 / 03 Feb 2009
Ability
S1E14 / 10 Feb 2009
Inner Child
S1E15 / 07 Apr 2009
Unleashed
S1E16 / 14 Apr 2009
Bad Dreams
S1E17 / 21 Apr 2009
Midnight
S1E18 / 28 Apr 2009
The Road Not Taken
S1E19 / 05 May 2009
There's More Than One of Everything
S1E20 / 12 May 2009
Season 2
A New Day in the Old Town
S2E1 / 17 Sep 2009
Night of Desirable Objects
S2E2 / 24 Sep 2009
Fracture
S2E3 / 01 Oct 2009
Momentum Deferred
S2E4 / 08 Oct 2009
Dream Logic
S2E5 / 15 Oct 2009
Earthling
S2E6 / 05 Nov 2009
Of Human Action
S2E7 / 12 Nov 2009
August
S2E8 / 19 Nov 2009
Snakehead
S2E9 / 03 Dec 2009
Grey Matters
S2E10 / 10 Dec 2009
Unearthed
S2E11 / 11 Jan 2010
Johari Window
S2E12 / 14 Jan 2010
What Lies Below
S2E13 / 21 Jan 2010
The Bishop Revival
S2E14 / 28 Jan 2010
Jacksonville
S2E15 / 04 Feb 2010
Peter
S2E16 / 01 Apr 2010
Olivia. In the Lab. With the Revolver.
S2E17 / 08 Apr 2010
White Tulip
S2E18 / 15 Apr 2010
The Man From The Other Side
S2E19 / 22 Apr 2010
Brown Betty
S2E20 / 29 Apr 2010
Northwest Passage
S2E21 / 06 May 2010
Over There (1)
S2E22 / 13 May 2010
Over There (2)
S2E23 / 20 May 2010
Season 3
Olivia
S3E1 / 23 Sep 2010
The Box
S3E2 / 30 Sep 2010
The Plateau
S3E3 / 07 Oct 2010
Do Shapeshifters Dream of Electric Sheep?
S3E4 / 14 Oct 2010
Amber 31422
S3E5 / 04 Nov 2010
6955 kHz
S3E6 / 11 Nov 2010
The Abducted
S3E7 / 18 Nov 2010
Entrada
S3E8 / 02 Dec 2010
Marionette
S3E9 / 09 Dec 2010
The Firefly
S3E10 / 21 Jan 2011
Reciprocity
S3E11 / 28 Jan 2011
Concentrate and Ask Again
S3E12 / 04 Feb 2011
Immortality
S3E13 / 11 Feb 2011
6B
S3E14 / 18 Feb 2011
Subject 13
S3E15 / 25 Feb 2011
Os
S3E16 / 11 Mar 2011
Stowaway
S3E17 / 18 Mar 2011
Bloodline
S3E18 / 25 Mar 2011
Lysergic Acid Diethylamide
S3E19 / 15 Apr 2011
6:02 AM EST
S3E20 / 22 Apr 2011
The Last Sam Weiss
S3E21 / 29 Apr 2011
The Day We Died
S3E22 / 06 May 2011
Season 4
Neither Here Nor There
S4E1 / 23 Sep 2011
One Night in October
S4E2 / 30 Sep 2011
Alone in the World
S4E3 / 07 Oct 2011
Subject 9
S4E4 / 14 Oct 2011
Novation
S4E5 / 04 Nov 2011
And Those We've Left Behind
S4E6 / 11 Nov 2011
Wallflower
S4E7 / 18 Nov 2011
Back to Where You've Never Been
S4E8 / 13 Jan 2012
Enemy of My Enemy
S4E9 / 20 Jan 2012
Forced Perspective
S4E10 / 27 Jan 2012
Making Angels
S4E11 / 03 Feb 2012
Welcome to Westfield
S4E12 / 10 Feb 2012
A Better Human Being
S4E13 / 17 Feb 2012
The End of All Things
S4E14 / 24 Feb 2012
A Short Story About Love
S4E15 / 23 Mar 2012
Nothing As It Seems
S4E16 / 30 Mar 2012
Everything in Its Right Place
S4E17 / 06 Apr 2012
The Consultant
S4E18 / 13 Apr 2012
Letters of Transit
S4E19 / 20 Apr 2012
Worlds Apart
S4E20 / 27 Apr 2012
Brave New World (1)
S4E21 / 03 May 2012
Brave New World (2)
S4E22 / 11 May 2012
Season 5
Transilience Thought Unifier Model-11
S5E1 / 28 Sep 2012
In Absentia
S5E2 / 05 Oct 2012
The Recordist
S5E3 / 12 Oct 2012
The Bullet That Saved the World
S5E4 / 26 Oct 2012
An Origin Story
S5E5 / 02 Nov 2012
Through the Looking Glass and What Walter Found There
S5E6 / 09 Nov 2012
Five-Twenty-Ten
S5E7 / 16 Nov 2012
The Human Kind
S5E8 / 07 Dec 2012
Black Blotter
S5E9 / 14 Dec 2012
Anomaly XB-6783746
S5E10 / 21 Dec 2012
The Boy Must Live
S5E11 / 11 Jan 2013
Liberty
S5E12 / 18 Jan 2013
An Enemy of Fate
S5E13 / 18 Jan 2013
Anna Torv
Olivia Dunham
Joshua Jackson
Peter Bishop
Jasika Nicole
Astrid Farnsworth
