Justin Theroux says he is 'enormously' happy with 'The Leftovers' finale

Theroux stopped by "GMA" to discuss the final episode, which airs Sunday.

"It's one of those awkward things where we're not allowed to talk about what's going on...I can tell you what's not going to happen," Theroux joked.

"I can say that I was very happy with the way the show ended, enormously," he added.

HBO's website gives only this cryptic explanation of the show's final chapter, titled 'The Book of Nora:' "Nothing is answered. Everything is answered. And then it ends."

"She's a fan of the show, so she didn't want any spoilers," he said. "She wouldn't even want to run lines with me ... She's that much of a fan."