With The Flash. Whether they have a personal connection to the Scarlet Speedster or are simply far more dangerous than most, these antagonists have proven to be memorable for a cascade of reasons.

The Flash was impressive from the beginning, including some of Barry Allen's most iconic villains from the very beginning, and setting the stage for what was to come. 9 seasons later, a plethora of incredible villains came and went on The Flash. From their costumes and overall design choices to the emotional toll they have on Team Flash, these villains were the most vital to the overall narrative of each of their respective seasons.

Season 1: Reverse-Flash

Played By Tom Cavanagh

Despite some unpopular fan opinions concerning Reverse-Flash, he had continuously been one of the most pivotal villains within The Flash's roster of rogues since the beginning. With a personal connection to Barry Allen, after claiming responsibility for the murder of his mother, Eobard Thawne immediately set himself apart from other antagonists due to the life-altering impact he had on the Speedster.

Thawne had repeatedly been a thorn in Team Flash's side, but it was the first season of the show that truly defined the character as the arch-nemesis to The Flash. The reveal that Harrison Wells was indeed the villain in disguise is still one of the major twists of the show; one that continues to haunt the whole Flash family to this day.

The Flash season 1 had to start off with a bang, which included a multitude of villains alongside Reverse-Flash. Other notable villains that appeared were Gorilla Grodd, Heatwave, Captain Cold, Weather Wizard, and the Trickster.

Season 2: Zoom

Played By Teddy Sears

Although season 2 might have relied upon a similar twist to The Flash's debut, Jay Garrick's transformation into Hunter Zoloman was one that played upon fresh wounds within the team and created conflict at the very heart of S.T.A.R. Labs.

As a physical threat, Zoom was imposing, with even his costume reflecting a sinister emissary of death on the hunt for his next kill. Although he was perhaps intellectually below Reverse-Flash, especially in regards to his true mission, the trouble he caused allowed Barry Allen to move forward in his life, becoming a catalyst for him to really rise as a true hero. Zoom is thus crucial to The Flash's journey.

Alongside Zoom, there were a number of villains that appeared throughout season 2, including King Shark, Killer Frost, The Turtle, Tarpit, and Dr. Light.

Season 3: Savitar

Played By Grant Gustin

Savitar posed an intriguing threat to Team Flash as it was the inevitability of the monster that made him so cruel. The implication that he would murder Iris West in the future, and was capable of manipulating anyone to get to that goal, was psychologically draining for Barry Allen.

Accompany that with the reveal that it was a twisted and villainous memory of Barry Allen beneath the spiked armor and Savitar immediately steps up the ranks of The Flash's worst foes. He once again left a mark upon the team, but victims such as those forced into the Cult of Alchemy and Savitar, like Julian Albert, were also permanently scarred by the Speedster from the past.

Though Savitar was a formidable force, there were other key villains that appeared throughout season 3. These included, Alchemy, Mirror Master, and Top.

Season 4: The Thinker

Played By Neil Sandilands

As one of The Flash's most intelligent enemies, The Thinker forced a different kind of conflict within the show's narrative. Clifford DeVoe was consistently one step ahead of S.T.A.R. Labs, which forced the group to think outside of the box in order to defeat him.

The Thinker's ideology allowed him to become a more memorable villain than most, but it was the intricate story surrounding his romance with Marlize that was both intriguing to watch and critical to the comic book antagonist's downfall. Plus, it's endlessly refreshing for Flash to face anyone with an alternative power set to his own.

Alongside The Thinker, a group of Flash's villains called The Rogues had a prominent role. These include, Captain Cold, Golden Glider, Mirror Master, Captain Boomerang, and Weather Wizard.

Season 5: Gorilla Grodd

Played By David Sobolov

Gorilla Grodd was never given the opportunity to be the big bad of any season. Usually, it is the major threat of the series which consequently rises as the best antagonist, yet Grodd proved that he was more than a match for the Crimson Comet, and season 5 boasted one of his most exciting appearances.

Featuring the psychic gorilla himself battling against King Shark, this was a kaiju-like fight for the ages. It demonstrated that in any situation Grodd could be a thrilling threat that endlessly contributed to the show thanks to his physicality and wide range of powers. Cicada in comparison was perhaps disappointing in comparison to a comic book accurate antagonist that continued to deliver with each ing showing.

A number of villains showed up in season 5 including, Cicada, Rag Doll, Weather Witch, and Silver Ghost.

Season 6: Anti-Monitor

Plated By LaMonica Garrett

Personally, The Flash encountered a number of significant crises upon the arrival of season 6, but The Anti-Monitor was the cosmic being that served as the largest villain of significance throughout this chapter of Barry Allen's superhero journey.

With the whole of the Multiverse at stake, Allen lost dear friends and allies to the wave of anti-matter that The Anti-Monitor set into motion. Not to mention the individual conflicts that took place as a direct result of the rogues' actions, this threatening god of epic proportions will forever haunt Team Flash, even if they did manage to step up to the plate. The DC Cinematic Universe will never be the same again after Anti-Monitor's arrival who could have initially been portrayed as a somewhat lame Flash comic book foe.

There are definitely other villains that show up in The Flash season 6, including, Ultraviolet, Godspeed clone, Bloodwork, and Reverse-Flash.

Season 7: The Speed Force

While there might have been a number of big bads in the seventh season of The Flash, The Speed Force is arguably the one that impacted Allen the most. The loss of Iris to the Mirrorverse was a hugely turbulent time for Team Flash, but without The Speed Force itself, Barry felt helpless to save his beloved or protect his family in the future.

The forces that emerged from the connection of Barry and Iris left a lot to be desired in of antagonists, but The Speed Force represented a cascade of feelings for The Scarlet Speedster. Taking the face of his mother only added to the inner turmoil, as Barry had to try to maintain his morally righteous position despite the consequences it could have on his powers and his ability to keep those he loves safe.

Season 8: Deathstorm

Played By Robbie Amell

Though he isn't the most significant villain in The Flash, Deathstorm stands out particularly because he inhabits the body of Ronnie Raymond, the once fiancé Caitlin Snow. Deathstorm is a fusion of Firestorm and the Negative Speed Force. In order to gain a physical form, Deathstorm began feeding off the people close to Caitlin Snow, making him a truly sinister villain.

Other villains that appear in season 8 are Chillblain, Reverse-Flash, and Godspeed.

Season 9: Red Death

Played By Javicia Leslie

The final season of The Flash had to close out the long-running series in suitable fashion. One way it did this was by incorporating a villain that was only introduced in the comics just a few years prior to the final season. Red Death was an alternate version of Batman with the superspeed of the Flash. For the TV series, Ryan Wilder is Red Death who is from Earth-4125. The Flash tried to incorporate the Batman mythos into the show by having Batwoman as the villain instead, which lead to some interesting developments in season 9.

ParagraphAlongisd Red Death, a plethora of villains appeared for The Flash's final season. These included Weather Wizard, Mirror Master, Blood Work, Goldface, and Pied Piper.

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