The Flash [OV]

A new big bad is introduced to Team Flash and friends and foes, old and new, begin to descend upon Central City in the season premiere.

Barry feels guilty for what happened to Caitlin. Mark hatches a plan which makes everyone skeptical. Red Death looms in Central City and commands that failure is not an option.

Barry and Iris believe they know what the Rogues are after. Team Flash recruits unlikely allies to help. Allegra does her best to avoid having a conversation with Chester.

LET THERE BE DARKNESS - The Flash (Grant Gustin) is forced to make an impossible choice. With the power out in the city, Team Flash calls upon the Rogue Squad to help as Iris (Candice Patton) is visited by an old friend. Joe (Jesse L. Martin) and Cecile (Danielle Nicolet) work on finding a balance.

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 his greatest mistake.

LUCK BE A LADY - As Barry (Grant Gustin) and Iris (Candice Patton) prepare for their new life, luck changes for those in Central City. Cecile (Danielle Nicolet) takes on a case with Allegra’s (Kayla Compton) help, involving a string of unfortunate - and highly unexpected - events. Meanwhile, Chester (Brandon McKnight) and the team work with Khione (Danielle Panabaker) to figure out her abilities.

When Iris and Nia Nal fall into a fever dream that explores different possibilities for their lives, Barry, Chester, Allegra and Cecile desperately try to help them.

A simple mold inspection at S.T.A.R. Labs leads to unexpected time anomalies. Barry and Iris try to make sense of the confusion - and figure out how to get back to their reality.

HAPPY BIRTHDAY, BARRY; STEPHEN AMELL, DAVID RAMSEY, KEIYNAN LONSDALE AND SENDHIL RAMAMURTHY GUEST STAR - Team Flash throws a surprise birthday party for Barry (Grant Gustin) but things go terribly awry when Ramsey Rosso (Sendhil Ramamurthy) crashes the festivities.

LIVE IN THE MOMENT - As Iris (Candice Patton) receives word of a career milestone, Barry (Grant Gustin) is suddenly nowhere to be found. In trying to get back home, Barry runs across many familiar faces. Khione (Danielle Panabaker) continues to figure out her powers and Chester (Brandon McKnight) works on a suit for Allegra (Kayla Compton).

BELIEVE IN THE IMPOSSIBLE; KAYLA COMPTON DIRECTS - Iris (Candice Patton) is alarmed by Barry’s (Grant Gustin) disappearance and Cecile (Danielle Nicolet) assures her everything will be ok, but does she know that for certain? Team Flash is affected by a mysterious substance and Khione (Danielle Panabaker) develops a better understanding of what she can and cannot control.

THE EXTRAORDINARY; JESSICA PARKER KENNEDY AND RICK COSNETT GUEST STAR - Team Flash works together to figure out how to protect Barry (Grant Gustin), all while being very careful who they trust. Cecile (Danielle Nicolet) is skeptical of the plan after an unsuccessful attempt. Khione’s (Danielle Panabaker) confidence in Chester (Brandon McKnight) enables him to convince Cecile to try one more time.

THE FINAL RUN - The Flash (Grant Gustin), 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