The Flash 100th Episode: Every Character Returning

The Flash is getting ready for its milestone 100th episode, and it's bringing back several characters from past seasons. The 100th episode will see Team Flash taking a trip back through their past for clues on how to defeat Cicada in the present. (Because what's an episode of The Flash without some time travel?) They will be visiting some of the greatest hits, toughest battles, and biggest foes from The Flash's past four seasons.

Along for the ride is Nora West-Allen, who will be seeing the events of her parents' past firsthand. Hopefully this will help her realize the hard choices they've had to make and how it affects their future decisions, especially after her dealing with her father putting his life on the line to save others in The Flash's most recent episode, "O Come, All Ye Thankful."

While not much else is known about the plot of The Flash's 100th episode, if it's anything like Arrow's 100th episode, then fans are sure to be in for a number of surprises, cameos, and emotional moments. However, here are the characters that are known to be making an appearance in The Flash season 5 episode 8, "What's Past is Prologue."

Team Flash Members Returning for The Flash 100th Episode

Of course The Flash's 100th episode cannot take place without the characters who have helped the show reach this point. Original cast members Barry Allen, Iris West-Allen, Cisco Ramon, and Caitlin Snow (and perhaps even Snow's alter-ego Killer Frost) will be joined by Ralph Dibny, Nora West-Allen, and Sherloque Wells for the big event. Sadly, one original cast member who probably will not feature in the episode is Jesse L. Martin as Detective Joe West, who's still on medical leave from The Flash.

They've been sure to mention him in previous episodes, so hopefully the trend continues, especially because of the important role Joe has always played in Barry's story. While no past Team Flash cast members such as Julian Albert, Wally West, or even Ronnie Raymond have been confirmed to appear in The Flash 100th episode, with the time travel aspect, anything is possible.

Cicada is Returning for The Flash 100th Episode

The whole reason for Barry and Nora's time travel excursions in The Flash season 5 is Cicada. Now that the team knows Cicada's real identity, they're one step closer to figuring out how to stop him and his metahuman power-dampening dagger.

While The Flash's 100th episode is meant to bring back past characters in order to celebrate the show's long-running streak on television, it still very much continues the ongoing story. According to the episode's synopsis says the team needs to gather "key necessities" from the past, whatever those may be. But it makes sense they need to look to the past since the future has been changed due to Nora's arrival.

Eobard Thawne/Reverse Flash is Returning for The Flash 100th Episode

The Flash Flash Back Review Barry Allen Eobard Thawne.

The Flash's 100th episode trailer (via YouTube) shows that traveling back in time will put Barry Allen face to face with The Flash TV show's previous main villains, including the villain that started it all: Eobard Thawne (from the looks of it, he's still disguised as Harrison Wells). Thawne betrayed Barry in The Flash season 1; he posed as a mentor and then admitted he was the one who killed Barry's mother, Nora Allen.

Even though Barry attempted to stop Thawne from murdering his mother, the creation of the Flashpoint timeline would've resulted in the end of the world. And so, Barry needed to allow Thawne to kill his mother in order to protect the timeline and save the world, and that's something he may have to relive once more... with his daughter. Thawne's presence in The Flash's 100th episode also means Tom Cavanaugh will be pulling triple duty, acting as both Sherloque and Thawne, as well as directing.

Page 2 of 2: More Flash Villains Returning For The Flash's 100th Episode

Zoom is Returning for The Flash 100th Episode

Another villain returning for The Flash 100th episode is Zoom. Voice actor Tony Todd is confirmed to be returning as the voice of Zoom with Teddy Sears appearing once again as Hunter Zolomon (who originally pretended to be the superhero Jay Garrick in The Flash season 2). Zoom is the supervillain who killed Barry Allen's father and went up against the Legion of Doom. While it will be great to have Sears back on the show, it's sure to be another dangerous reunion.

Savitar is Returning for The Flash 100th Episode

As if facing off against the Reverse Flash and Zoom wasn't enough, Barry will also see himself up against his future self/time remnant Savitar. It's sure to be an interesting family reunion, but will the future Flash Museum have warned Nora about this particular part of her father's past? Just what Barry hopes to learn from all these previous foes seems to be The Flash's 100th episode's biggest mystery, as many of these supervillains have killed (or have come close to killing) people that Barry loves the most, including his mother, his father, and one of his closest friends.

The Rival & Trajectory Are Returning for The Flash 100th Episode

The Rival and Trajectory The Flash 100th episode

Zoom voice actor Tony Todd said all the speedster villains are returning for The Flash 100th episode. Does this include the Rival and Trajectory (notable for being The Flash's first female speedster), both of whom only appeared in a few episodes as well? Only time will tell, but it would be interesting if speed or the Speed Force itself held some clue to defeating Cicada. It's proven helpful in the past, so it would make sense for it to happen again, especially since the Speed Force has played a significant part throughout the series.

The Flash's 100th episode, "What's Past is Prologue," is sure to be an exciting hour of television for longtime fans who've seen the on-screen Barry Allen go through several ups and downs over the past four years. Whatever happens, though, the episode is not only going to progress Team Flash's story forward in their attempt to defeat Cicada but also potentially set up the following week's Arrowverse crossover event, Elseworlds, which appears to be bringing 1990's The Flash TV show into canon.