The Disneynature film "Dolphin Reef" will feature the voice of an Academy Award winner.

streaming service when it launches this fall.

The dolphin-centric film features "Disneynature's signature storytelling style," per Disney, and is directed by "Bears" filmmaker Keith Scholey. It follows a young Pacific bottlenose dolphin named Echo who is dealing with growing up and the new responsibilities he'll have to take on. We'll see his story play out thanks to amazing underwater footage of the coral reef where he lives.

Portman will be on hand to tell Echo's story. This won't be her first time narrating a documentary. She previously worked on PBS's "The Armenian Genocide" and HBO's "Hitler's Pawn: The Margaret Lambert Story." The actress most recently starred in "The Death & Life of John F. Donovan" and "Vox Lux."

The "Dolphin Reef" is one of many originals set to premiere on Disney+. The streaming service will offer fiction and nonfiction programming alike, plus old favorites.

"Dolphin Reef" will premiere on Nov. 12, the same day when Disney+ launches.