The Flash Season 6 Reviews and Episode Guide

The Flash Season 6 has completed its run, but we've got everything you need to know about the series right here.

The Flash season 6 has finally concluded its run. It was a few episodes earlier than we had expected or hopes, thanks to a COVID-19 related production shutdown, but it still managed to be the best overall season of the show in years.

Whether it was Barry’s sharp new Flash costume, new showrunner Eric Wallace, the way the series was rocked by the events of Crisis on Infinite Earths, the way this season is put the women of Team Flash and the Central City Citizen front and center, or just the most compelling villains we’ve seen since season three, The Flash Season 6 was a winner.

The Flash Season 6 Episodes

If you’ve already watched the season, use our reviews as a guide to checking out the series when it hits Netflix. But if you haven’t… beware of spoilers!

The Flash Season 6 Episode 1: Into the Void

“While Barry (Grant Gustin) and Iris (Candice Patton) deal with the heartbreaking loss of their daughter, Nora, the team faces their greatest threat yet — one that threatens to destroy all of Central City. Meanwhile, Killer Frost (Danielle Panabaker) has a brush with death that results in an unexpected new dynamic that will change her relationship with Caitlin forever.”

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air date: 10/8/19

read our review of “Into the Void” here.

The Flash Season 6 Episode 2: A Flash of the Lightning

“Faced with the news of his impending death, Barry’s (Grant Gustin) resiliency suffers as he struggles to fight fate. Meanwhile, Cecile’s (Danielle Nicolet) career as a D.A. conflicts with her identity when she crosses paths with a villainous meta-human.”

air date: 10/15/19

read our review of “A Flash of the Lightning” here.

The Flash Season 6 Episode 3: Dead Man Running

Knowing that Crisis is only weeks away, Barry (Grant Gustin) prepares a member of Team Flash for life without him while hunting a terrifying meta-human with an unquenchable thirst. Meanwhile, Ralph (Hartley Sawyer) uncovers a family secret.”

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air date: 10/22/19

read our review of “Dead Man Running” here.

The Flash Season 6 Episode 4: There Will be Blood

Barry’s (Grant Gustin) efforts to prepare Cisco (Carlos Valdes) for Crisis are derailed when Cisco schemes to save Barry’s life instead. Meanwhile, Ramsey Rosso (guest star Sendhil Ramamurthy) uses his deadly new abilities to save his own life, while sacrificing his humanity in the process.”

air date: 10/29/19

read our review of “There Will be Blood” right here.

The Flash Season 6 Episode 5: Kiss Kiss, Breach Breach

“Cisco’s (Carlos Valdes) faith in his ability to fill Barry’s (Grant Gustin) shoes as Team Leader is upended when he learns of a shocking murder. Meanwhile, Killer Frost (Danielle Panabaker) trusts no one except herself to hunt down the dangerous Ramsey Rosso (guest star Sendhil Ramamurthy).”

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air date: 11/5/19

read our review of “Kiss Kiss Breach Breach” here.

The Flash Season 6 Episode 6: License to Elongate

“Barry (Grant Gustin) turns his attention to prepping Elongated Man (Hartley Sawyer) for life after Crisis and without The Flash, but Ralph ultimately teaches Barry a lesson. Meanwhile, Cecile (Danielle Nicolet) faces her own moment of self-discovery while helping a recuperated Chester P. Runk (guest star Brandon McKnight) reclaim his identity.”

Danielle Panabaker will direct this episode.

air date: 11/19/19

read our review of “License to Elongate” here.

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The Flash Season 6 Episode 7: The Last Temptation of Barry Allen Part One

“As Barry Allen (Grant Gustin) stands on the threshold of his impending death in Crisis, his convictions are tested when the monstrous Dr. Ramsey Rosso (guest star Sendhil Ramamurthy) infects The Flash with a mysterious, hallucinogenic contagion. Meanwhile, reporter Iris West-Allen (Candice Patton) uncovers a vast conspiracy.”

air date: 11/26/19

read our review of “The Last Temptation of Barry Allen Part One” here.

The Flash Season 6 Episode 8: The Last Temptation of Barry Allen Part Two

“With The Flash (Grant Gustin) battling Bloodwork (guest star Sendhil Ramamurthy), Iris (Candice Patton), and Cisco (Carlos Valdes) fight to help Barry take control before he’s lost to Ramsey’s influence. Meanwhile, the rest of Team Flash fight to reclaim Central City from Bloodwork’s growing army.”

air date: 12/3/19

read our review of “The Last Temptation of Barry Allen Part Two” right here.

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The Flash Season 6 Episode 9 – Crisis on Infinite Earths: Part Three

Pariah (Tom Cavanagh) enlists Black Lightning (guest star Cress Williams) to help stop the Anti-Monitor (guest star LaMonica Garrett) after Flash-90 (guest star John Wesley Shipp) shares what he learned from his battle in ‘Elseworlds.’  With the help of Black Lightning, Barry (Grant Gustin), Cisco (Carlos Valdes) and Killer Frost (Danielle Panabaker) come up with a plan that could save them all.  Meanwhile, Iris (Candice Patton) has a heart-to-heart with Ryan Choi (guest star Osric Chau), while Oliver (guest star Stephen Amell) and Diggle (guest star David Ramsey) return to an old familiar stomping ground.”

air date: 12/10/19

Read our review of “Crisis on Infinite Earths Part Three” right here.

The Flash Season 6 Episode 10: Marathon

After The Citizen prints an explosive story, Iris’s (Candice Patton) life is threatened. Refusing to hide from those that are attacking her, Iris sets out to expose a dangerous organization. Meanwhile, Barry (Grant Gustin) must face the consequences of the Crisis and fulfill Oliver Queen’s wish for him.”

air date: 2/4/20

read our review of “Marathon” here.

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The Flash Season 6 Episode 11: Love is a Battlefield

Barry (Grant Gustin) and Iris (Candice Patton) plan a romantic dinner for Valentine’s Day but their evening is interrupted by an old foe – Amunet (guest star Katee Sackhoff). Meanwhile, Frost (Danielle Panabaker) gets into the holiday spirit and attempts to help Allegra (guest star Kayla Compton) reconnect with an old love.”

air date: 2/11/20

The Flash Season 6 Episode 12: A Girl Named Sue

After months of searching for Sue Dearbon (guest star Natalie Dreyfuss), Ralph (Hartley Sawyer) gets a lead on her whereabouts and finally comes face to face with his missing client. However, Sue refuses to return home to her family, and instead, takes Ralph on a daring adventure. Iris (Candice Patton) faces a new challenge while Barry (Grant Gustin) considers a potentially dangerous request from a trusted source.”

air date: 2/18/20

read our review of “A Girl Named Sue” here.

The Flash Season 6 Episode 13: Grodd Friended Me

“Feeling overwhelmed with all the changes since Crisis, Barry (Grant Gustin) conducts an experiment that goes awry and puts him directly in Gorilla Grodd’s (voiced by David Sobolov) path.  Expecting the worst, Barry is surprised when Grodd asks for his help. Unfortunately for both The Flash and Grodd, things get worse when another villain appears – Solovar (voiced by Keith David). Meanwhile, Iris (Candice Patton) works with Eva (guest star Efrat Dor) to escape the Mirrorverse.”

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air date: 2/25/20

read our review of “Grodd Friended Me” here.

The Flash Season 6 Episode 14: Death of the Speed Force

“Kid Flash (guest star Keiynan Lonsdale) returns to Central City with a Zen attitude and new tricks up his sleeve.  While thrilled to see his family again, Wally confides to Barry (Grant Gustin) that he returned because he thinks there is something wrong with the speed force.  Meanwhile, Cisco (Carlos Valdes) returns from his fact-finding mission across Earth-Prime.”

air date: 3/10/20

read our review of “Death of the Speed Force” here.

The Flash Season 6 Episode 15: The Exorcism of Nash Wells

“The Flash (Grant Gustin) takes on a dangerous new meta named Sunshine (guest star Natalie Sharp). Cisco (Carlos Valdes) sets out to help Nash (Tom Cavanagh).”

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air date: 3/17/20

read our review of “The Exorcism of Nash Wells” here.

The Flash Season 6 Episode 16: So Long and Goodnight

“After Black Hole hires Rag Doll (guest star Troy James) to kill Joe (Jesse L. Martin), Singh (guest star Patrick Sabongui) suggests he go into Witness Protection but Joe refuses to stop investigating Carver (guest star Eric Nenninger).  While investigating Carver with Cisco (Carlos Valdes), Ralph (Hartley Sawyer) runs into Sue (guest star Natalie Dreyfuss). Iris (Candice Patton) becomes suspicious of Eva (guest star Efrat Dor).”

air date: 4/21/20

read our review of “So Long and Goodnight” here!

The Flash Season 6 Episode 17: Liberation

“After recent events, Barry (Grant Gustin) takes a closer look at his life with Iris (Candice Patton).  Eva (guest star Efrat Dor) makes a bold move.”

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air date: 4/28/20

read our review of “Liberation” here.

The Flash Season 6 Episode 18: Pay the Piper

“When Godspeed returns, Barry (Grant Gustin) turns to Hartley Rathaway (guest star Andy Mientus) for help.  However, things get tense quickly after Barry realizes one of the changes from Crisis is that The Flash and Pied Piper are now enemies. Meanwhile, Iris (Candice Patton) tries to escape the Mirrorverse.”

air date: 5/5/20

read our review of “Pay the Piper” here.

The Flash Season 6 Episode 19: Success is Assured

“Barry (Grant Gustin) considers a risky plan to save Iris (Candice Patton) from the Mirrorverse. Ralph (Hartley Sawyer) attempts to stop Sue (guest star Natalie Dreyfuss) from making a grave mistake that could destroy her life.”

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air date: 5/12/20

As it turns out, because of the ongoing coronavirus pandemic, this season will be shorter than expected, so “Success is Assured” is the season finale.

read our review of “Success is Assured” here.

The Flash Season 6 Villain

Sendhil Ramamurthy (best known for his work on Heroes) played Dr. Ramsey Rosso a.k.a. Bloodwork for the first half of the season. Rosso is a brilliant physician who works on hematological oncology. He’s a friend of S.T.A.R. Labs’ Caitlin Snow (Danielle Panabaker), and meets back up with her after an unexpected event. Rosso’s desire to defy the laws of nature take him down a dark path where he enters the pantheon of Flash villainy. We wrote more about Bloodwork here!

Efrat Dor (Mayans MCSneaky Pete) played Eva McCulloch, the new Mirror Master. She ended up being the best villain the show has seen in years. We interviewed Ms. Dor about bringing the Mirror Mistress to life right here.

The Flash Season 6 Story

The Flash has to deal with the aftershocks of this year’s Crisis on Infinite Earths crossover event, which promises to shake the Arrowverse to its very core. There’s no doubt that life will change for Barry, especially after an event as famous as DC’s biggest and best Crisis. As some of you already know, a DC Crisis usually means that a Flash is about to die.

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You can also expect some big changes coming for Caitlin Snow and Killer Frost this year. We have more details on that right here.

We’ll keep you updated as we hear more about The Flash season 6. 

The Flash Season 6 Cast

Natalie Dreyfuss (The OriginalsStill the King) joined in the recurring role of Sue Dearbon. The casting foreshadows a monumental development for the television arc of Ralph Dibny/Elongated Man, since, as discerning DC Comic fans already know, Sue is destined to become his wife and cohort. The character first appeared back in The Flash Vol 1 #119, dated March 1961, introduced as a wealthy-family-hailing debutante who the enamored superheroic schmoe, Ralph, manages to woo after some crimefighting circumstances. We interviewed Ms. Dreyfuss about bringing Sue to life here.