Its really eating at him.

Hes trying to do his thing.

Its a very different angst that he has this year than he had last year.

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Credit: Katie Yu/The CW

What can you tease about The Turtle?

Hes going up against a villain who is literally slowing him down.

This is one of our best episodes coming back that weve ever done.

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Jack Rowand/The CW

It feels big and emotional.

Barry is considering telling Patty that he is The Flash.

What might stand in the way of that happening?

Hes really thinking about actually doing it until he talks to Wells (Tom Cavanagh).

Whether or not Barry ends up taking it remains to be seen.

Is Harry basically the perfect spy for Zoom since no one suspects anything amiss with him?

Essentially the devil has his child and is telling him to turn on all these people.

This Wells just wanted to save his daughter.

He didnt come over here to make friends and find a family.

The emotional toll that this possible betrayal is taking on him is some of Toms best work.

Its so different this year.

Were really proud and excited about this storyline this season for Tom.

How its going to continue to play out is really exciting.

What can you tease for the West family getting to know Wally?

Theres a new West.

In the beginning, Joe goes through all the stages of being a parent.

Initially, hes trying way too hard to be insta-dad.

Wally is not having that.

So you have both of these young men who are vying for that place and Joes affection.

How do Barry and Wally get along?

Initially not very good.

In the beginning, its fraught.

For Barry, hes always felt like Joes son.

What does the dynamic between Wally and Iris look like?

Shes the sane one in any relationship shes in.

Shes the one who is trying to get Joe to pull back a little bit on the gas.

Also, were going to learn that Wally is a street racer.

Hes racingFast and the Furious-style races.

Because of that, hes in danger.

Iris is the one who is trying to massage him through what Wally needs to be.

Thats really what Wally needs, especially [with Francine dying].

What can you tease about Barrys next face-off with Zoom?

Ill tease that it might not take place on our Earth.

What can you tell us about what brings the team to Earth-2?

At some point, theyre going to decide to take the fight to Zoom.

What is it like coming face-to-face with their doppelgangers?

Some of these people are beyond different.

They seem different until you start seeing the crazy differences between all of our other cast members.

Then hes the one who doesnt seem quite so different and crazy anymore.

Jesse L. Martin previously mentioned there could be amusical componentto his doppelganger.

Did that actually end up happening?

I wouldnt be surprised if that was true.

Will we see more of Iris journalism career explored more in the coming episodes?

We actually have a lot of that in episode 12, which is directed byDoctor Whofavorite Rachel Talalay.

That episode is called Fast Lane, and its all about Wally and his drag racing.

The villain in that one is Tar Pit (Marco Grazzini).

Its really Iris and her journalism thats driving the story.

Its a really great story for her, were really excited about it.

What brings theReverse-Flashback into the picture?

Time on our show does not unfold linearly.

Sometimes youve seen events from one direction and then you start to see them from the other.

This Reverse-Flash is not exactly the Reverse-Flash that we saw disintegrate at the end of the year.

Its a Reverse-Flash from an earlier timeline.

Its not the Earth-Two Reverse-Flash, itstheReverse-Flash.

That is, hands down, one of our best episodes.

The closest thing I can describe it to isDoctor Who.

What can you tease for King Sharks return, when the Diggles come to Starling City?

We were blown away by how King Shark turned out as everybody else.

We were so excited to bring him back.

We were trying to think about where hes been.

I pitched to Greg [Berlanti], Well, what if A.R.G.U.S.

has him, because he does have that tie to A.R.G.U.S.

because of Suicide Squad in the comic book.

Maybe Lyla [Audrey Marie Anderson] comes to town to pick him up.

He said, Well, not just Lyla, she should bring her husband.

You have an idea, and Greg has a better version of it.

it’s possible for you to really have fun and explore the different dynamics between everybody.

Will we see more of those smaller crossovers in the back half of the season?

We dont have any definitive plans for them.

I cant promise we wont.

We havent really broken past episode 18 right now.

The Flashreturns Tuesday at 8 p.m.

ET on The CW.