The Flash fans are still suffering through the long winter hiatus, which doesn't end until Tuesday, January 19th. At that time, we'll be getting a whole bunch of Barry Allen as Season 2 carries on with it's second half. Today, we have a new trailer, which gives us an exciting first look at Killer Frost in action. We also get to see our first glimpses of Earth-2 Barry and Iris West. And, by God, is that Reverse Flash coming back for a second attack? It just might be!

With just under one month until The Flash returns with the midseason premiere Potential Energy, a report from yesterday revealed that Barry (Grant Gustin) is about to come face to face with a familiar foe in the back half of Season 2. Entertainment Weekly reports that Matt Letscher is returning as Eobard Thawne, a.k.a. Reverse Flash. The actor is set to appear Season 2's 11th episode, fittingly entitled Reverse Flash Returns.

In Season 1, it was revealed early on that Harrison Wells (Tom Cavanagh) was the Reverse Flash, but towards the end of the season, we learned that was only part of the story. As it turns out, the real Harrison Wells is dead, but Eobard Thawne (Matt Letscher), who traveled back in time to kill Barry Allen's mother, absorbed Wells' DNA and took on his persona to train Barry with his new speedy powers. In the Season 1 finale, Eobard's ancestor, Eddie Thawne (Rick Cosnett) sacrificed himself, which essentially erased Eobard from the timeline.

Related: Ezra Miller Promises The Flash Movie Is Still Happening

While it isn't known how Eobard will return to Central City, it certainly seems possible that this could be the Earth-2 version of Eobard. It isn't known if Matt Letscher is set to come back for any other episodes besides Reverse Flash Returns, which is slated to air Tuesday, January 26, one week after the midseason premiere Potential Energy airs on Tuesday, January 19. When he does come back, though, he won't be the first character to come "back from the dead," so to speak.

Despite Harrison Wells already being dead, the show's exploration of Earth-2 allowed for Tom Cavanagh to return as a different version of Harrison Wells. We've seen in the first half of Season 2 that Barry is finally starting to trust the Earth-2 version of Wells, a relationship which could be in danger with the re-emergence of Reverse Flash. Other characters who are already confirmed for the back half of Season 2 include Marco Grazzini as the villain Tar Pit and Adam Stafford as Geomancer.

Fans will also learn a lot more about Keiynan Lonsdale's Wally West, who was introduced in the fall finale Running to Stand Still earlier this month. In the comics, Wally becomes "Kid Flash," but it still isn't known if he will turn into Kid Flash by the end of Season 2 or not. Matt Letscher has previously had recurring roles on Scandal, The Carrie Diaries and Boardwalk Empire. What do you think about Reverse Flash returning in Season 2 of The Flash? You can see him teased here, in this latest exciting sneak peek.

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B. Alan Orange