The Flash will return the flash reversed, but for a special episode

Flash will use some of the most intriguing villains in the series, including a fan favorite for the 100th episode.

The episode of next Tuesday The flash marks the 100th. In over four seasons and 99 shenanigans, it's a crazy race for Barry Allen, Iris West and the other members who joined the Flash team over the last four years, creating this episode.

The bad guys have been spreading since the beginning, the big battles succeeding one season at a time. Season 5 Cicada running through Central City, but there were four before him.

The "What Past Is Prologue" promo revealed the return of villains from the past, including the fan favorite, Reverse-Flash, which made Team Flash's life a living hell in Season 1.

Sherloque Wells wants the Flash team to travel in the past to learn how to defeat Cicada in the future. This is a nightmarish journey in memory for Barry, who has to face the first Harrison Wells, the surprise return of Teddy Sears Zoom and Savitar.

These villains, especially Tom Cavanagh as Harrison Wells, have made the first seasons of The flash special.

Season 1 was the origin of Barry. He obtained speedster powers with the particle accelerator created by Wells, which led to a teacher-student relationship, eventually collapsing under the final phase of the leader of S.T.A.R Labs.

This is not the version of Reverse-Flash Matt Letscher, since Barry has treated the character of Cavanagh throughout season 1.

So, this unique return for Cavanagh as this original Flash the villain should provide the plot.

Clifford "The Thinker" DeVoe was not present in the caravan, but it may be too early to reopen this sore.

In episode 8, however, will these old villains really help Barry conquer the Cicada? These villains usually stagger on a full season. Therefore, all that the Scarlet Speedster discovers in the past will not work in the future.

The flash will broadcast "What's Past Is Prologue" on Tuesday, December 4 at 20h. AND on the CW. This is the last episode before the three-night crossing event, Other worlds.