Watch There Will Be Blood. Episode 4 of Season 6.

4. There Will Be Blood

As the Crisis draws closer, Barry tries to prepare Cisco for the inevitable. Also, Ramsey Rosso searches for a more permanent cure to his illness.

Watch Kiss Kiss Breach Breach. Episode 5 of Season 6.

5. Kiss Kiss Breach Breach

Cisco puts his leadership skills to the test while Barry and Iris take a mini-vacation. Meanwhile, Killer Frost sets out to track down Ramsey Rosso.

Watch License To Elongate. Episode 6 of Season 6.

6. License To Elongate

Barry tags along with Ralph in hopes of teaching him to be heroic in a post-Flash world. Nash asks Allegra for help with a life-or-death project.

Watch The Last Temptation of Barry Allen: Part 1. Episode 7 of Season 6.

7. The Last Temptation of Barry Allen: Part 1

Barry is tested as never before when Ramsey Rosso infects him with a malicious virus. Iris investigates a sinister plot.

Watch The Last Temptation of Barry Allen: Part 2. Episode 8 of Season 6.

8. The Last Temptation of Barry Allen: Part 2

As Iris and Cisco fight to save Barry from Ramsey’s evil influence, the rest of Team Flash battles Bloodwork’s army throughout Central City.

Watch Crisis on Infinite Earths: Hour Three. Episode 9 of Season 6.

9. Crisis on Infinite Earths: Hour Three

Joined by Supergirl, Black Lightning and others, Barry and Team Flash search for a way to stop the antimatter wave from destroying the multiverse.

Watch Marathon. Episode 10 of Season 6.

10. Marathon

Following a hot tip, Iris investigates a nefarious organization. Meanwhile, Barry sets out to uncover the mystery behind a mask.

Watch Love is a Battlefield. Episode 11 of Season 6.

11. Love is a Battlefield

Barry and Iris's Valentine's Day dinner is rudely interrupted by a pesky nemesis. Also, Allegra gets some unsolicited assistance from Frost.

Watch A Girl Named Sue. Episode 12 of Season 6.

12. A Girl Named Sue

Months after his search went cold, Ralph finally gets a lead on Sue Dearbon. Meanwhile, Iris plays with mirrors and Barry re-opens a closed case.

Watch Grodd Friended Me. Episode 13 of Season 6.

13. Grodd Friended Me

Frustrated and overwhelmed by all the lingering changes from the Crisis, Barry undertakes an experiment with surprising consequences.

Watch Death of the Speed Force. Episode 14 of Season 6.

14. Death of the Speed Force

Kid Flash delivers a dire warning about the Speed Force to Barry. Also, Cisco returns to help take on a dangerous meta.

Watch The Exorcism of Nash Wells. Episode 15 of Season 6.

15. The Exorcism of Nash Wells

Eva enlists the duplicate versions of Iris and Kamilla for a mission. Plus, Team Flash examines Nash while Barry faces a dangerous new foe.

Watch So Long and Goodnight. Episode 16 of Season 6.

16. So Long and Goodnight

Despite being in serious danger, Joe refuses to take caution. Barry struggles to conserve his speed. Iris shares a secret with Eva.

Watch Liberation. Episode 17 of Season 6.

17. Liberation

Increasingly worried about his wife's shifting personality, Barry searches for an explanation. Also, Eva prepares to step into a new world.

Watch Pay the Piper. Episode 18 of Season 6.

18. Pay the Piper

The return of Godspeed inspires Barry to ask Hartley Rathaway for help, as tension and doubt threaten to tear Team Flash apart.

Watch Success is Assured. Episode 19 of Season 6.

19. Success is Assured

Barry and Ralph investigate a suspicious warehouse in hopes of finally getting a lead on Eva. Later, Barry delivers Carver a dire warning.