But Gallagher says that both shows are a lot more alike than you may think.

“There’s a lot of similarities betweenThe O.C.

andZoey’sin my mind,” the actor tells EW.

ZOEY’S EXTRAORDINARY PLAYLIST

was right on the heels of 9/11.

There was a drumbeat of xenophobia, a suspicion of outsiders, ready to condemn the other.

And they struck me as such cowardly and unAmerican responses to what was perceived to be a threat."

ZOEY’S EXTRAORDINARY PLAYLIST

“This is an extraordinary family dramedy,” he says.

He hasn’t abandoned himself or who he is.

And he’s not afraid to open his arms and welcome others.

ZOEY’S EXTRAORDINARY PLAYLIST

And I thought, ‘That’s American.

That’s the story I want to be part of telling.’

And you know how many musicals that never went anywhere?

ZOEY’S EXTRAORDINARY PLAYLIST

So a new musical is like finding a unicorn.

“It was just an experience I didn’t want to miss.

I’m just thrilled and delighted to see people responding to it.

I’m seeing how many people have family members who have had PSP.

So I don’t really think about it to the end.”

“It’s bittersweet,” he adds.

“So it’s like you’re really thrilled to be part of a good story told well.

And you want to stay with it.

But you might’t.”

“The chance to be a dad was too good to pass up,” Gallagher says.

And he was receptive to my input."

“I always found him compelling and I still do,” he says.

It already means something to Gallagher, who lost a loved one to a degenerative illness.

“My mother had Alzheimer’s for 20 years,” he says.

“Even in those last moments I really felt very connected to her,” he says.

“I saw and felt the mom I knew, even though I hadnt spoken to her in ages.

So this is a great role.”

Zoey’s Extraordinary Playlistairs Sundays at 9 p.m. on NBC.