The Flash

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.

With the power out in the city, Team Flash calls upon the Rogue Squad to help as Iris is visited by an old friend. Joe and Cecile 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.

Barry and Iris prepare for their new life. Luck changes for Central City. Cecile takes on a case with Allegra's help. Chester works with Khione 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)

Iris is alarmed by Barry's disappearance and Cecile assures her everything will be ok, but does she know that for certain? Team Flash is affected by a mysterious substance.

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.

The Flash, the fastest man alive, is tasked with his greatest challenge yet, to save the timeline and save existence. Friends gather to save Central City, one last time.