Hes got this demonic quality to him, Grant Gustin tells EW.

Hes much stronger and faster, and Barrys not necessarily ready for this, but he thinks he is.

Team Flash, however, doesnt necessarily agree.

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Credit: Dean Buscher/The CW

She really takes that to heart.

Even Cisco (Carlos Valdes), who has always supported Barrys decisions, will be concerned.

Its very clear in Tuesdays episode that Zoom is not a threat to be taken lightly, Valdes says.

Once the gravity of that hits the team, things start to change a little bit.

Its definitely a slow burn because of the magnitude of this evil.

[Zooms] peeked into other timelines.

Zoom has been planning this for quite a while and hes much faster and much more powerful.

He has his ways of peeking into Barrys life at different points of his life without anyone being aware.

If you created a speedster, youd know about a speedster, Cavanagh maintains.

It doesnt align me with anybody.

Youve gotten a glimpse of what this guys life is like, Cavanagh says.

Then you see this man in S.T.A.R.

A person who is cornered like that is going to act a different way…

This version is all about getting what he needs.

His whole life revolves around getting what he needs and nobody and nothing is going to stop him.

The big question, though, is exactly who is Zoom?

The theories fly fast on set.

I think its Felicity [Emily Bett Rickards], Gustin jokes of Barrys formerArrowflame.

Panabaker concurs: I love the idea of it being Earth-Two Barry Allen.

Selfishly, as actors, how fun would it be to get to do both extremes?

The introduction of Earth-Two into our story is bringing all these different dimensions as far as possibilities are concerned.

In truth, There are infinite possibilities, really, Gustin says.

It could really turn out to be a number of characters.

To be honest, I dont really know the answer, so Im not sure.

But there may be one cast member who knows Zooms true identity.

I dont have a theory on it, Cavanagh says cryptically.

Theoretical implies a whole different thing from fact.

Who do you think is under Zooms mask?

Find out whenThe Flashairs Tuesdays at 8 p.m.

ET on The CW.