This week's episode of The Flash is giving us not one, not two, but three speedsters teaming up to save Central City from its biggest threat yet.

When a nuclear bomb detonates downtown, Barry (Grant Gustin) is forced to enter Flashtime, where he's speeding around looking for a solution while everyone else in the city stands still, essentially frozen in time. Thanks to his newest power, which allows him to bring non-speedsters into Flashtime with him, he'll be able to get some help from Team Flash, but this task may be too big even for them.

Luckily, Jesse Quick (Violett Beane) just so happens to be in town for a visit from Earth 2, meaning it's up to her and Barry, and eventually Jay Garrick (John Wesley Shipp), to figure out how to diffuse a bomb that's already gone off. TV Guide spoke exclusively with Violett Beane to find out how Jesse will take on this huge task.

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What has Jesse been up to on Earth 2 since we last saw her?

Violett Beane: Jesse has been whoopin' villains, putting them behind bars. Drinking a couple lattes here and there. She's just been doing her Flash thing over there.

What brings Jesse to Central City for this episode?

Beane: Jesse actually comes back to Central City to talk to her father, Harrison (Tom Cavanagh). Last time you saw them on screen there was kind of that disconnect and sort of, "I need space," kind of thing. So when Jesse comes back, she comes back because she receives an apology cube from Harrison, and so she's like, "Okay, this should be good. What does he want to talk about?" Since we've last seen her, she actually kicked him off of her team, and that's why he came back to Central City — because she just couldn't have him be part of the team anymore. So it's kind of nice. There's a lot of moments in the episode of the two of them dealing with their relationship and how to move forward.

Earth 2 has a cube for everything. Apology cube, breakup cube, sexting cube.

Beane: You know, honestly it's similar to our world now, without doing anything face to face. You just kind of send someone a snapchat, and that's it.

Violett Beane, The Flash Photo: Katie Yu, Katie Yu/The CW

Can you tease anything about Jesse and Wally's first scene together on DC's Legends of Tomorrow in the wake of that breakup cube she sent?

Beane: Jesse shows up and has a conversation with Wally about where they're at in their relationship - a little bit apologetic. And then things kind of take a bit of a twist... It's really fun. I'm excited to have them back in a room together. I think fans are going to love it. There is a little bit of awkwardness, like, "How have you been? It's been a while," and kind of catching up a little bit.

Barry and Jesse spend a lot of this episode in Flashtime, so what does that actually look like?

Beane: It was really cool shooting because we had a ton of background, a ton of stunt people, and all the other main actors there, and everyone was just frozen. And we got to like walk around them which was cool. In the story, Jesse is there talking to Harrison and then the bomb detonates, and her and Barry go into Flashtime and try basically for the whole episode to figure out what to do. They try a bunch of different options like, "Oh we could run it out of the city," but then there's not enough time to do that and there's not enough time to take everyone in the city out of the city. So there's like all these options that we're considering.

Jay Garrick eventually joins the team to help find a solution too. Will there be any butting of heads between these three speedsters?

Beane: There's a little bit of that for sure. Everyone thinks they know what's right.

Is Jesse at all tempted to stick around Central City afterwards?

Beane: I think she enjoys time there, and she leaves things with her father on more of a positive note than when she came, for sure. I do think she enjoyed it, but I mean, she's got a whole other world to protect. She can't leave them every time Central City needs her help.

The Flash airs Tuesdays at 8/7c on The CW.

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