The "Thelma & Louise" star confirmed the news at her Bentonville Film Festival in Arkansas on Friday, May 10, revealing she'll be part of the series when it returns on August 2.
She is voicing a character named Huntara.
The news comes days after Davis revealed she offered herself up to director Patty Jenkins for the "Wonder Woman" sequel at the festival in 2017.
The movie veteran, who is also a former Olympic archer, cornered the filmmaker and suggested she should have a role in the follow-up - because she has all the traits of a female warrior.
"I said, 'Hey, wow, the movie's so great and you're probably gonna do a sequel. I don't know if you're looking for anyone kind of Amazonian...' and she's much shorter than me, so she looked up and said, 'Yeah'," Geena recalled.
"But I'm not in the second one (movie). Maybe the third one," the actress added.