Look for the spouses to experience a new dynamic in their healthy relationship.

It was kind of crazy to have that kind of tension with Randall, Watson tells EW.

Its a way that they are with each other that we havent seen before.

This Is Us - Season 1

Ron Batzdorff/NBC

And it doesnt get wrapped up quickly.

She sums up: Its going to take them to a new place in their relationship.

Its really going to stretch them, and I think thats the best way I can put it.

As he discovers, his adopted parents werent on the same page about bringing him home.

(you’ve got the option to see the scene here.)

Hes not trying to replicate what Jack and Rebecca had.

Hes overjoyed to be able to spend quality time with his children, says Brown.

Mom, and hes in no hurry to get back into a corporate environment.

(Its fun because hes actually good at it, and why wouldnt Randall be?

He strives for that sort of perfection in things.)

The roles will fully reverse as Beth heads back to work as an urban planner.

Dont miss PEOPLE and EWsThis Is UsLIVE viewing party!

Go toPeople.comandEW.comon Tuesday, Sept. 26 beginning 8 p.m. Randall is on the East Coast, while the twins are out west.

I like them starting apart so that they can work their way together, says Brown.

I know that theres been some real thoughtfulness in terms of how they work their way back together.

Watson issues a succinct tease for the premiere: New beginnings.

And now we are, too.

This Is Usreturns on Tuesday