Taking to her Instagram on Sunday, the actress shared a video of herself running on a treadmill, as she prepares to reprise her role as the original Wasp for "Ant-Man and the Wasp: Quantumania," which begins principal photography in July and is expected to debut in 2023.
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"Janet van Dyne entering the Quantum Realm this summer," the 63-year-old Oscar nominee told her fans in the clip. "I'll be ready."
Evangeline Lilly, who plays Pfeiffer's daughter Hope van Dyne in the franchise, commented, "Go Mama! 💪🏼💫🔥."
In 2018, Pfeiffer joined the Marvel Universe as the shrinking superhero for "Ant-Man and the Wasp," which was the first sequel to 2015's "Ant-Man." The film also featured Michael Douglas as her husband Hank Pym and, of course, Paul Rudd playing Scott Lang, aka Ant-Man.
Around the time of the film's debut, Pfeiffer expressed how excited she was to be joining a comic book adaptation at the age of 60.
"I loved that in this phase in my life I'm playing a superhero," she told People. "The message that it sends to women of all ages that we are still kicking ass."
"I loved that she is such a seminal character in the Marvel comic book world," she added of the Wasp. "And that is one of the founding members of the Avengers. I would have a lot of conversations with [director] Peyton [Reed] that Janet was a warrior and she is a very important and brilliant scientist unto herself, which was exciting to me."
"Quantumania" is due out February 17, 2023 -- following the releases of "Black Widow," "Shang-Chi and the Legend of the Ten Rings," "Eternals," "Spider-Man: No Way Home," "Doctor Strange in the Multiverse of Madness," "Thor: Love and Thunder," "Black Panther: Wakanda Forever" and "The Marvels."