The trailer for The Flash season 8, episode 18, reveals the shocking return of a major Arrowverse villain who hasn't appeared on the show for years.

WARNING: This article includes spoilers from The Flash season 8, episodes 17 and 18.

The trailer for The Flash season 8, episode 18 reveals the shocking return of a major Arrowverse villain who hasn't appeared on the show for years. Things are starting to come full circle as The Flash season 8 has only a few episodes left to air. Like most seasons of the Arrowverse drama, things usually become more chaotic towards the very end, as Barry Allen and his team tackle their latest villain. Currently, The Flash is trying to solve Iris West-Allen's time-sickness, as Candice Patton's character went missing back in episode 14.

While Iris' time-sickness will be solved, there is still the matter of figuring out who is the newest Big Bad in The Flash season 8. The last threat Team Flash dealt with was Deathstorm, as the Arrowverse show provided a new take on the DC baddie, who first appeared in The Flash season 2. In The Flash season 8, episode 17, "Keep it Dark," Tom Cavanagh's Eobard Thawne, a.k.a. the Reverse-Flash, made his return since the events of Armageddon. As Barry suspected Eobard to be the mysterious speedster running around, it was revealed that the Arrowverse villain was still locked away at Lian Yu.

Following The Flash season 8, episode 17, "Keep it Dark," The CW (via TV Promos) has released a trailer for episode 18, which airs next week on Wednesday, June 15. Titled "The Man in the Yellow Tie," the episode features the return of a major The Flash antagonist. While Cavanagh's Eobard was back this week, The Flash season 8, episode 18, will feature the original Reverse-Flash, as Matt Letscher's iteration of the DC villain appears in the footage. Check out the trailer below.

Click here to view the trailer on YouTube

The Flash season 8, episode 18, marks Letscher's first episode on the show since the season 3 premiere, "Flashpoint." While Reverse-Flash hasn't appeared on The Flash since 2016, the actor did join Legends of Tomorrow as part of the Legion of Doom. The title "The Man in the Yellow Tie" is a call-back to The Flash season 1, episode 9, "The Man in the Yellow Suit." Whether or not Letscher's Eobard will come face-to-face with Cavanagh's iteration remains to be seen, since it's unclear if the latter will appear in The Flash season 8, episode 18 at all.

The most interesting aspect of The Flash season 8, episode 18 trailer is the big reveal that this Eobard, from his point of view, hasn't met Barry yet or become the Reverse-Flash. The footage also included the intriguing twist that Eobard is working together with Meena Dhawan, a.k.a. Fast Track. While it may appear in this trailer that Eobard hasn't become the Reverse-Flash yet, it wouldn't be shocking if the character is simply putting on an act. It will be intriguing to see how The Flash season 8 explains that this Eobard is in 2022, given that he's from 2151, and what his return really means.

MORE: The Flash's "Max" Tease Sets Up A Major New Character For Season 9

Source: TV Promos