In his first regular TV role in nearly 20 years, Eric Bana has gone dark.

But that doesnt meanDirty Johncant have some fun along the way.

Bana keys into this ina breakout performancethat starts out equally slimy and beguiling.

Dirty John - Season 1

Nicole Wilder/Bravo

Check out our conversation below.Dirty Johnairs Sunday nights at 10 p.m. ENTERTAINMENT WEEKLY: So how did you get involved withDirty John?

Thered been a series of articles and then a podcast that was really high quality.

They were looking at turning it into a limited series.

I thought it was fantastic.

I sat down with the producers; Id already met Connie before and was a huge fan of hers.

She was attached to the project already, so it wasnt difficult to connect the dots.

Were getting a lot of pieces of information about things that have happened.

We werent really getting a whole lot of information about him.

I was intrigued by that.

I knew that thered be a pretty unique opportunity to flesh that out.

Wed be in a great position for that.

He had no friends.

I always find that to be a highly suspicious thing about someone.

What makes them mysterious also often makes them very dangerous.

It forces us to wonder and give a shot to fill in the gaps.

When youre trying to fill in the gaps about someone, its obviously a fair warning sign.

Its not that hard to imagine someone falling for [someone like] Debra and enjoying their time together.

I do believe that initially they share a bond and a very passionate romance.

I dont think all that was necessarily made up by him.

We had some fun planting pieces of information for people, to be revealed much later in the season.

How did you enjoy working with Connie?It was wonderful.

I really benefited from working with someone as intelligent as her.

It wasnt just about playing the scenes for what they were at that moment in time.

Connie was so well-calibrated in all of that stuff.

Shes just a delight to work with and a great partner.

Something feelsoffabout John from the beginning.

Anytime we can see that someone is telling a lie, it always lays a sort of mistrust.

We have plenty of that early on.

The chilling side of him initially is a byproduct of his lying.

I wasnt deliberately trying to make him reek of mistrust in the initial stages.