When Eternals was released in 2021, it became Marvel Studios' first "Rotten" movie. Unfortunately, the fact it hit theaters during the final months of the pandemic meant it also struggled to make a significant impact at the box office.

While there's no denying it was a little overstuffed (and that it boasted an abysmal villain in Kro), there was a lot about Eternals which did work. The movie arguably has something of an undeserved bad rap, particularly as it showed a different side of the MCU and set the stage for some exciting future stories.

Nearly four years later, Marvel Studios still hasn't announced plans to address that big cliffhanger. As a result, it's unclear whether we'll ever learn what became of the Eternals taken from Earth by Arishem for judgment after their role in stopping Tiamut's emergence.

Captain America: Brave New World will, however, confirm the Celestial as the source of Adamantium in the MCU.