Jack and Rebecca [Mandy Moore] in the beginning.
What themes are emerging in season 3?Discovery of the past.
Ill stick with those two, respectfully, for Jack.

Credit: Ron Batzdorff/NBC
Jack has a lot of baggage from his past including his time in Vietnam.
Michael Angarano has been cast as Nicky.
Weve only seen Nicky as a young boy.
What is young adult Nicky like?
What is the dynamic of their relationship as adult brothers?Theyre very close.
Jack is very much still the older brother that looks out for his younger brother.
But Jack kind of cant help but always want to do better for his brother.
Kevin is off to Vietnam, presumably to learn more about Jacks past.
How would you characterize the revelations and surprises that are in store for viewers?
When Dan first told you about it,you said that Holy s was your reaction.Its still the same.
Its still a Holy s!
Where do this seasons emotional gut punches rank for you?Definitely up there.
The thing that hes really protecting his family from knowing thats the stuff thats interesting to me.
Dan said that the show is going to focus an episode on Vietnam.
Its a journey of discovery for both Pearson men.
We need to see that.
We need to see Jack before Rebecca.
We need to see a Jack that is in some happy times as well as some hard times.
We also need to see the discovery of love [between] Jack and Rebecca.
So playing the younger years of Jack, Im just very much looking forward to.
Hes curious to see how its all going to unfold for Jack.
War is not a good thing.
Its a very hard, destructive process, and no one really wins in the end.
The season premiere shows the first date of Jack and Rebecca.
There were some new mysteries dropped into the season 2 finale, not necessarily involving you.
Was there a relief in that?
Like, Okay, you guys take on some of the mystery?
Thank god I dont have to Fort Knox that secret this year too much.
Ill leave it to everyone else.
Ill ask you one question.
How big is this thing?Its pretty huge.
For season 3 intel from creator Dan Fogelman,head over here.
For even more hints from Mandy Moore,click here.