Ahead of the "Elseworlds" crossover, The Flash will air its landmark 100th episode, and it's shaping up to a doozy of an hour as Barry Allen (Grant Gustin) takes his daughter Nora (Jessica Parker Kennedy) on a dangerous trip down memory lane where they cross paths with a number of the biggest and baddest villains the Scarlet Speedster has ever faced.
The new promo isn't particularly spoiler-y, but we do catch a sneak preview of the returns of the Reverse-Flash (Tom Cavanagh), Zoom (Teddy Sears), and Savitar (Grant Gustin) - and those are only the secrets we know about.
Expect the episode to feature a number of other surprises that should be welcome treats for fans.
"What's Past is Prologue" - (8:00-9:00 p.m. ET) (TV-PG, V) (HDTV)
TOM CAVANAGH DIRECTS THE 100TH EPISODE - In the 100th episode, Barry (Grant Gustin) and Team Flash come up with a plan to stop Cicada (Chris Klein). However, the plan calls for Barry and Nora (Jessica Parker Kennedy) to travel back in time to gather some key necessities. However, Barry hesitates, concerned about his daughter seeing certain parts of his life. Meanwhile, Sherloque (Tom Cavanagh) takes his concerns about Nora to Iris (Candice Patton), and Caitlin (Danielle Panabaker) turns up a key asset in the fight against Cicada. Tom Cavanagh directed the episode written by Todd Helbing & Lauren Certo (#508). Original airdate 12/4/2018.
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The Flash -- "What's Past is Prologue" -- Image Number: FLA508a_0079bc.jpg -- Pictured: Jessica Parker Kennedy as Nora West - Allen -- Photo: Jeff Weddell/The CW -- © 2018 The CW Network, LLC. All rights reserved
The Flash -- "What's Past is Prologue" -- Image Number: FLA508a_0103bc.jpg -- Pictured: Grant Gustin as Barry Allen -- Photo: Jeff Weddell/The CW -- © 2018 The CW Network, LLC. All rights reserved
The Flash -- "What's Past is Prologue" -- Image Number: FLA508a_0175bc.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Jessica Parker Kennedy as Nora West - Allen -- Photo: Jeff Weddell/The CW -- © 2018 The CW Network, LLC. All rights reserved
The Flash -- "What's Past is Prologue" -- Image Number: FLA508a_0289bc.jpg -- Pictured (L-R): Grant Gustin as Barry Allen, Danielle Panabaker as Caitlin Snow and Jessica Parker Kennedy as Nora West - Allen -- Photo: Jeff Weddell/The CW -- © 2018 The CW Network, LLC. All rights reserved
The Flash -- "What's Past is Prologue" -- Image Number: FLA508a_0334bc3.jpg -- Pictured: Candice Patton as Iris West - Allen -- Photo: Jeff Weddell/The CW -- © 2018 The CW Network, LLC. All rights reserved
The Flash -- "What's Past is Prologue" -- Image Number: FLA508a_0335bc2.jpg -- Pictured (L-R): Candice Patton as Iris West - Allen and Grant Gustin as Barry Allen -- Photo: Jeff Weddell/The CW -- © 2018 The CW Network, LLC. All rights reserved
The Flash -- "What's Past is Prologue" -- Image Number: FLA508a_0341bc.jpg -- Pictured (L-R): Danielle Panabaker as Caitlin Snow and Hartley Sawyer as Dibney -- Photo: Jeff Weddell/The CW -- © 2018 The CW Network, LLC. All rights reserved
The Flash -- "What's Past is Prologue" -- Image Number: FLA508b_0031bc.jpg -- Pictured: Chris Klein as Cicada -- Photo: Jack Rowand/The CW -- © 2018 The CW Network, LLC. All rights reserved
The Flash -- "What's Past is Prologue" -- Image Number: FLA508b_0043bc.jpg -- Pictured (L-R): Behind the scenes with Jessica Parker Kennedy, Chris Klein, Director Tom Cavanagh and Grant Gustin -- Photo: Jack Rowand/The CW -- © 2018 The CW Network, LLC. All rights reserved
The Flash -- "What's Past is Prologue" -- Image Number: FLA508b_0129bc.jpg -- Pictured (L-R): Behind the scenes with Chris Klein as Cicada and Director Tom Cavanagh -- Photo: Jack Rowand/The CW -- © 2018 The CW Network, LLC. All rights reserved
Matching wits with The Thinker, who by season’s end had harnessed the powers of all twelve bus metas he created, stretched Team Flash to their limits, but with the help of some new allies, Barry Allen (aka The Flash) and company were able to put a stop to the Enlightenment and save Central City once again. However, with the arrival of Barry and Iris’ speedster daughter, Nora, who arrived from the future admitting to having made a “big mistake,” things are anything but status quo. Will parenthood be the challenge that finally slows The Flash down?
The Flash features:
Grant Gustin as Barry Allen/The Flash
Candice Patton as Iris West-Allen
Danielle Panabaker as Caitlin Snow/Killer Frost
Carlos Valdes as Cisco Ramon/Vibe
Tom Cavanagh as Dr. Harrison Wells
Jesse L. Martin as Detective Joe West
John Wesley Shipp as Henry Allen/Jay Garrick
Michelle Harrison as Nora Allen
Keiynan Lonsdale as Wally West/Kid Flash
Violett Beane as Jesse Quick
Danielle Nicolet as Cecille Horton
Hartley Sawyer as Ralph Dibny/Elongated Man
Jessica Parker Kennedy as Nora Allen
Chris Klein as Cicada
The Flash returns with an all-new episode on November 27