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The Flash, the fastest man alive, is tasked with his greatest challenge yet -- to save the timeline and save existence; friends old and new gather for an epic battle to save Central City, one last time.

The Flash

A New World, Part Four

Team Flash works together to figure out how to protect Barry, all while being very careful who they trust; Cecile is skeptical of the plan after an unsuccessful attempt; Khione's confidence in Chester enables him to convince Cecile to try again.

A New World, Part Three

Iris is alarmed by Barry's disappearance and Cecile assures her everything will be OK; Team Flash is affected by a mysterious substance; Khione develops a better understanding of what she can and cannot control.

A New World, Part Two

As Iris receives word of a career milestone, Barry is suddenly nowhere to be found; Barry runs across many familiar faces; Khione continues to figure out her powers; Chester works on a suit for Allegra.

A New World, Part One

Team Flash throws a surprise birthday party for Barry, but things go terribly awry when Ramsey Rosso crashes the festivities.

It's My Party and I'll Die If I Want To

A seemingly simple mold inspection at S.T.A.R. Labs leads to unexpected time anomalies; Chester admits a secret to Allegra, which makes things awkward between the two; Khione meets with an old friend of Team Flash.

Partners in Time

Iris and Nia fall into a fever dream and explore different possibilities for their lives; Barry, Chester, Allegra and Cecile desperately try to help them; Khione feels that Mark is trying to make her something she is not.

Wildest Dreams

Barry and Iris prepare for their new life; Cecile takes on a case involving a string of unfortunate and highly unexpected events; Chester and the team work with Khione to figure out her abilities.

The Good, the Bad and the Lucky

As the Red Death wreaks havoc on Central City, Barry and Iris come up with a plan and turn to Cecile for help; Barry is faced with what he thinks was his greatest mistake; Joe gives Barry a needed pep talk.

The Mask of the Red Death, Part Two

The Flash is forced to make an impossible choice; with the power out in the city, Team Flash calls upon the Rogue Squad to help; Iris is visited by an old friend; Joe and Cecile work on finding a balance.

The Mask of the Red Death, Part One

Barry and Iris start to put together the pieces of what's happening in Central City and believe they know what the Rogues are after; the team recruits some unlikely allies to help; Allegra does her best to avoid having a conversation with Chester.

Rogues of War

Barry feels guilty for what happened to Caitlin; Mark comes up with a plan that makes everyone skeptical; Red Death looms in Central City and commands that failure is not an option; old friends pay an unexpected visit to S.T.A.R. Labs.

Hear No Evil

Investigator Barry Allen discovers that he has special powers, following the explosion of a scientific instrument; he tries to use his powers for good and stop those that are inclined differently.

S9 E10 | A New World, Part One

E13 | A New World, Part Four

E12 | A New World, Part Three

E11 | A New World, Part Two

E10 | A New World, Part One

E9 | It's My Party and I'll Die If I Want To

E8 | Partners in Time

E7 | Wildest Dreams

E6 | The Good, the Bad and the Lucky

E5 | The Mask of the Red Death, Part Two

E4 | The Mask of the Red Death, Part One

E3 | Rogues of War

E2 | Hear No Evil