According to director Peyton Reed, Michelle Pfeiffer's Janet Van Dyne will play a pivotal role in Ant-Man and the Wasp. He stressed the character's importance in the sequel, following her brief appearance in 2015's Ant-Man.
"She's a very important character. It's fair to say if someone were to have spent thirty-something years in the Quantum Realm and survived, it would have an effect," Reed told Empire Magazine. "What did she eat? All she eats is cereal called Quantum Krispies."
Janet was seen in her superhero role as the Wasp during a quick flashback in Ant-Man as Hank Pym (Michael Douglas) explained why he hung up the mantle to Scott Lang (Paul Rudd). On a mission to disable a Soviet nuclear missile, she disappeared into the subatomic quantum realm, which Lang coincidentally came back from at the movie's climax.
This will be a major plot driver in the sequel, as it has inspired Hank and his daughter Hope van Dyne (Evangeline Lilly) to explore the microverse to try to rescue Janet. In a previous interview, Lilly has said this newfound interest in the microverse will lead to revelations about the multiverse.
Ant-Man and the Wasp opens July 6, 2018 and stars Paul Rudd as Scott Lang, Evangeline Lilly as Hope van Dyne, Michael Douglas as Hank Pym, Michelle Pfeiffer as Janet van Dyne, Judy Greer as Maggie, Bobby Canavale as Paxton, Michael Peña as Luis, T.I. as Dave, David Dastmalchian as Kurt, Walton Goggins as Sonny Burch, Hannah John-Kamen as Ghost, and Lawrence Fishburne as Bill Foster.