For years,Pretty Little Liarsfans have been theorizing about the presence of a twin.

More importantly, Mary is the twin of Alis mother, Jessica DiLaurentis.

But what is Marys story?

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Credit: Freeform

And why does she seem to have such a grudge against Ali?

We spoke with the twin herself, Andrea Parker, about her return to the show.

ENTERTAINMENT WEEKLY: What has the fan reaction been so far?

ANDREA PARKER:Its extraordinary.

Its a mutual adoration society with all the fans for all of us.

I was overwhelmed with the love that I received.

Its such a relief as Mary for the fans to be equally as excited and not upset with me.

Im thrilled that they are embracing Mary.

What was your reaction when you found this out?

It was very exciting!

Im just so happy to have a new character, to have some fresh blood.

You mentioned that Mrs. D had her creepy moments, but Mary is another story.

How do these characters two differ for you in terms of playing them?

Though they are identical twins, I think that there hearts are very different.

Jessicas heart was in the right place.

I think she was consistently trying her best to do the right thing.

Mary, perhaps not so much.

Thats the nicest way to put it: Perhaps shes not great.

She is definitely darker.

We aged her up a little bit with the frumpy khakis.

Marys look is more current and edgier.

I saw you mention you had to keep this secret for something like six months?

Just because we have such a relationship.

Is she motivated by revenge, money, all of the above?

Revenge, money, jealousy, love, vengeance, YES.

Marlene mentioned well get abit more backstory moving forward.

Did they give you much to craft this character?

Mostly what I have so far are plot points.

How ironic would it be if Mary killed Mrs. D?

That would be awesome.[Laughs.]

Youre into all of it.

Im gonna dive in head first.

Being a villain on this show, the skys the limit.

What are you most looking forward to?

I dont know if this sounds weird, but Im looking forward to playing her emotional journey.

I am no longer scared of the dark places within my own self to magnify and become Mary.

So look out, b-es.