The Flash

The Flash is an American superhero television series developed by Greg Berlanti, Andrew Kreisberg, and Geoff Johns, airing on The CW. It is based on the DC Comics character Barry Allen / Flash, a costumed superhero crime-fighter with the power to move at superhuman speeds. It is a spin-off from Arrow, existing in the same fictional universe known as Arrowverse. The series follows Barry Allen, portrayed by Grant Gustin, a crime scene investigator who gains super-human speed, which he uses to fight criminals, including others who have also gained superhuman abilities.

Season 1 (2014)
The first season of the American television series The Flash premiered on The CW on October 7, 2014, and concluded on May 19, 2015, after airing 23 episodes. The series is based on the DC Comics character Barry Allen / Flash, a costumed superhero crime-fighter with the power to move at superhuman speeds. It is a spin-off from Arrow, existing in the same fictional universe, and was produced by Berlanti Productions, Warner Bros. Television, and DC Entertainment, with Andrew Kreisberg serving as showrunner.
 * New Speedsters: The Flash, Reverse Flash
 * Main Antagonist: Reverse Flash (Eobard Thawne)
 * Current Wells: Eobard Thawne (fake)
 * Villainous faction: Metahumans
 * Metahuman cause: Particle accelerator
 * Pilot:  Pilot
 * Finale: Fast Enough

Season 2 (2015)
The second season of the American television series The Flash, which is based on the DC Comics character Barry Allen / Flash, sees Barry recognized as a hero in Central City after saving the city, only to face a new threat from a parallel universe in the form of the speedster Zoom, who seeks to eliminate everyone connected to the Speed Force throughout the multiverse. It is set in the Arrowverse, sharing continuity with the other television series of the universe, and is a spin-off of Arrow. The season was produced by Berlanti Productions, Warner Bros. Television, and DC Entertainment, with Andrew Kreisberg, Gabrielle Stanton, Aaron Helbing, and Todd Helbing serving as showrunners.
 * New Speedsters: Kid Flash, Zoom, Jay Garrick, Trajectory, Black Flash
 * Main Antagonist: Zoom (Hunter Zolomon)
 * Current Wells: Harry Wells
 * Villainous faction: Earth-2 Metahumans
 * Metahuman cause: Particle accelerator (Earth-2)
 * Pilot:  The Man Who Saved Central City
 * Finale: The Race of His Life

Season 3 (2016)
The third season of the American television series The Flash, which is based on the DC Comics character Barry Allen / Flash, a costumed superhero crime-fighter with the power to move at super speeds, follows Barry, a crime scene investigator who gains super-human speed, which he uses to fight criminals, including others who have also gained superhuman abilities. It is set in the Arrowverse, sharing continuity with the other television series of the universe, and is a spin-off of Arrow. The season was produced by Berlanti Productions, Warner Bros. Television, and DC Entertainment, with Andrew Kreisberg, Aaron and Todd Helbing serving as showrunners.
 * New Speedsters: Savitar, Jessie Quick, Rival,
 * Main Antagonist: Savitar (Future Barry)
 * Current Wells: H.R. Wells
 * Villainous faction: Savitar's Worshippers
 * Metahuman cause: Flashpoint Paradox
 * Pilot:  Flashpoint
 * Finale:  Finish Line

Season 4 (2017)
The fourth season of the American television series The Flash, which is based on the DC Comics character Barry Allen / Flash, premiered on The CW on October 10, 2017, and ran for 23 episodes until May 22, 2018. The season follows a crime scene investigator with superhuman speed who fights criminals, including others who have also gained superhuman abilities. It is set in the Arrowverse, sharing continuity with the other television series of the universe, and is a spin-off of Arrow. The season is produced by Berlanti Productions, Warner Bros. Television, and DC Entertainment, with Andrew Kreisberg and Todd Helbing serving as showrunners.
 * New Speedsters: Blitzkreig, Accelerated Man
 * Main Antagonist: The Thinker (Clifford DeVoe)
 * Current Wells: Harry Wells (stupid)
 * Villainous faction: DeVoe's subjects
 * Metahuman cause: Flash's return from Speedforce
 * Pilot:  The Flash Reborn
 * Finale: We Are the Flash

Season 5 (2018)
The fifth season of the American television series The Flash, which is based on the DC Comics character Barry Allen / Flash, premiered on The CW on October 9, 2018, and concluded on May 14, 2019, with a total of 22 episodes.[1] The season follows Barry, a crime scene investigator with superhuman speed who fights criminals, including others who have also gained superhuman abilities, as he deals with the consequences of his future daughter's time traveling. It is set in the Arrowverse, sharing continuity with the other television series of the universe, and is a spin-off of Arrow. The season was produced by Berlanti Productions, Warner Bros. Television, and DC Entertainment, with Todd Helbing serving as showrunner.
 * New Speedsters: XS, Barry Allen (Earth-90), Godspeed, Iris West (formerly)
 * Main Antagonist: Cicada (Orlin Dwyer)
 * Current Wells: Sherloque Wells
 * Villainous faction: Meta-tech villains
 * Metahuman cause: "Meta-tech" from the Enlightenment
 * Pilot:  Nora
 * Finale: Legacy

Season 6 (2019)
The sixth season of the American television series The Flash, which is based on the DC Comics character Barry Allen / Flash, premiered on The CW on October 8, 2019, and consisted of 19 episodes. The season follows Barry, a crime scene investigator with superhuman speed who fights criminals, including others who have also gained superhuman abilities. It is set in the Arrowverse, sharing continuity with the other television series of the universe, and is a spin-off of Arrow. The season is produced by Berlanti Productions, Warner Bros. Television, and DC Entertainment, with Eric Wallace serving as showrunner.
 * New Speedsters: Godspeed clones, DCEU Flash, Grodd Flash
 * Main Antagonist: Bloodwork (Ramsey Rosso) and Mirror Mistress (Eva McColluch)
 * Current Wells: Nash Wells/ Pariah
 * Villainous faction: Black Hole
 * Metahuman cause: The Crisis
 * Pilot:  Into the Void
 * Finale: Success is Assured

Season 7 (2021)
Nothing is known about this season except that the last three episodes of Season 6 will be the first three episodes of this season.
 * New Speedsters: TBA
 * Main Antagonist: TBA (Cobalt Blue?)
 * Current Wells: Nash Wells
 * Villainous faction: TBA
 * Metahuman cause: TBA
 * Pilot:  All's Wells That Ends Wells
 * Finale: TBA