Get ready, Flash fans. Barry Allen is going to other worlds next season.

While speaking to TV Guide about tonight’s first season finale of The Flash, series star Grant Gustin had some very interesting comments about what’s coming up in the show.

“What’s fun about this show is that there’s going to be multiple timelines as we move forward,” explained Gustin. “I think we’re going to start showing Earth-One and Earth-Two in the near future. There will be kind of different dimensions going on.”

The first season of The Flash has already introduced time travel to the mix, and the season finale appears to revolve around Barry’s attempt to change the past and save his mother. The Flash creative team has previously hinted that the series might explore the “Flashpoint” storyline–which put Barry in a vastly changed world after he succeeded in saving his mother.

Unveiling the DC multiverse on this series is fitting, given the very idea for it was introduced in the classic “Flash of Two Worlds” story from The Flash #123 in 1961.

“Flash of Two Worlds” introduced Barry Allen to Jay Garrick, DC’s original Flash, paving the way for the annual crossovers between the Justice Society and the Justice League. On The Flash TV series, the multiverse could potentially be used to bring in some of DC’s other Flashes, including Garrick, Wally West, Bart Allen, and more.

But the most likely scenario for the multiple Earths would be to use the main cast of The Flash in different incarnations of their characters. And who doesn’t love a good Mirror Universe story?! TV Guide speculates that the alternate Earths may also be a way to establish Cisco Ramon (Carlos Valdes) and Caitlin Snow (Danielle Panabaker) as the metahumans Vibe and Killer Frost, based on their comic book incarnations.

The new spinoff series, DC’s Legends of Tomorrow will be heavily relying on time travel if the recently released trailer is any indication. But as the TV Guide story notes, it may become even more difficult to keep track of the continuity between Arrow, The Flash, and Legends of Tomorrow if The Flash changes the timeline of all three series. The closest comparison on TV is when Warehouse 13 was time-screwed by Eureka’s continuity changes. In the long run, it wasn’t a big deal for Warehouse 13. It just made the crossovers between the two series a little confusing.

For The Flash, Valdes acknowledged that “it gets a little Rubik’s Cube-y in terms of keeping consistency between all these timelines and whatnot… But the writers have their stuff together. If I were to trust anyone, it would be them.”

The Flash wraps up its first season Tuesday night, and will return to The CW for season 2 this fall.

What do you think about there being Earth-One and Earth-Two on the series? Let’s hear it in the comments.