Billions' biggest investment finally paid off.

“The two of us have admired her work for a long time.

Shes a marvel, one of the greats, and a legend for a reason.

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Paul Giamatti and Julianna Margulies on ‘Billions’.Credit: Jeff Neumann/SHOWTIME

Above, watch an exclusive clip of Margulies making herBillionsdebut.

So it was one of those where just timing worked out and the character was great.

I play a sociology professor at Yale who has written this one book that was aNew York TimesNo.

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Jeff Neumann/SHOWTIME

It was a fun character to dive into.

Whats the experience been like so far?

Ben Shenkman, who I didCanterburys Lawwith, Steve Kunken, who I was on Broadway with.

Yet, I dont have to carry the whole show.

Its been really easy.

Paul Giamatti is the consummate actor.

Im just having a really good time.

Oh my god, it really is.

Its like a staycation.

Now, going in, I dont know how I did it.

Its a very different beast and Im really enjoying myself.

So she isnt deterred by his behavior, which he finds that quite enlightening.

What’s it been like diving into the scripts forBillions?

[Laughs] I think thats probably just as hard as medical dialogue or lawyer dialogue.

But my character stands a little bit aside from that kind of dialogue because its not her world.

Billionsairs Sundays at 9 p.m.