Producer Nate Moore told Screen Rant about Thena’s narrative during a roundtable interview, explaining that “She has a tragic story in our film in that she comes down with something called Mahd Wy’ry.” Her condition is pulled straight from the comics, and it causes extreme memory loss due to living for 7,000 years. Or, as Moore pointed out, “It’s a version of dementia” for the Eternals.
The producer went on to explain, “Because of the amount of memories they have, they become unstuck in their own mind, so she starts to forget exactly when she is.” He also explained that Jolie’s hero isn’t alone in her ordeal, adding, “so through the course of the movie, Gilgamesh becomes her protector.”
The teasers and trailers for the film have shown Gilgamesh (Don Lee) and Thena in an isolated cabin. Moore noted that this is because Jolie’s character has become a genuine threat because of her abilities. “And when we find them in the modern-day, they’re living off the grid in a cabin in Australia because she’s too dangerous to have around humans,” he said. Remember, Thena can manifest weapons out of thin air whenever she likes, which is a dangerous power to have if she’s not in control of herself.
But it sounds as if the role gives the actress plenty to explore. Moore added, “it’s a fun arc for Angelina to play.” Hopefully, she isn’t relegated for the whole film, as there are 7,000 years of history to explore after all.