Peggy Carter has a very big decision to make in the season finale ofMarvels Agent Carter.

At this point, you realize the extent of Whitneys abuse of power, Atwell tells EW.

I think shes kind of an addict, and Zero Matter is her drug of choice.

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Credit: Kelsey McNeal/ABC

Whitney is someone who is very dangerous, Atwell continues.

Shes a psychopath, even to the point where her own people have turned against her.

Its quite scary for Peggy to make a run at work out.

Unfortunately, it happens that Whitneys used her brain for the force of evil.

Its Peggys self-fulfilling prophecy, I guess.

Its a real struggle for her because she really wants to love, Atwell says.

I could end up harming them even more and end up alone again.

I think the whole thing is quite difficult and dangerous for her emotionally.

The season finale ofMarvels Agent Carterairs Tuesday at 9 p.m.