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Gwen Verdon was a four-time Tony-winning star of Broadway and of several shows Fosse worked on, includingSweet CharityandChicago.

Sam Rockwell as Bob Fosse and Michelle Williams as Gwen Verdon.

And asFosse/Verdonemphasizes, she was a key creative force in their partnership.

A lot of that stuff is hiding in plain sight, director and executive producer Thomas Kail said.

We knew the projects that Gwen had done.

We knew that Gwen showed up on the set ofCabaret.

On the show, Fosse and Verdons film and stage productions often become metaphors for their relationship.

Its instead following the emotional journey of these two characters and seeing what best incident would express that story.

Because theyre musical-theater people, of course song and dances would be part of that.

(As we see on the show, Verdon helped MacLaine learn the steps.

And yet, it wasnt.

Fosse and Verdons relationship crumbled primarily due to his womanizing habits.

It had to do with his demons, and maybe he is the genius to explore those demons.

One wasnt necessary for the other.

These are people we felt had something in their DNA that just matched, according to Kail.

The big stars also occupy the side portion of the story, a reversal that amusedFosse/Verdons creators.