<Li> Abby Ryder Fortson as Cassie: The daughter of Lang and Maggie . </Li> <Li> Randall Park as Jimmy Woo: An FBI agent and Lang's parole officer . </Li> <Li> Michelle Pfeiffer as Janet van Dyne: The original Wasp who is lost in the quantum realm . She is Pym's wife and Hope's mother . Pfeiffer was Reed's dream casting for the role since his time working on the first film, and he ensured that he received her input on the character . He noted that the character has spent 30 years in the quantum realm, so there is a question regarding how that has affected her . Producer Kevin Feige explained that the character ages over those 30 years even though time works differently in the quantum realm to avoid any "sci - fi weirdness" that could take away from the emotional reunions with Pym and Hope in the film . Hayley Lovitt stands in for a young Janet van Dyne, reprising her role from the first film; according to Reed, she had been cast in the first film, before Pfeiffer's involvement, due to her "saucer - like, Michelle Pfeiffer eyes ." </Li> <Li> Laurence Fishburne as Bill Foster: An old friend of Pym who was once his assistant on Project Goliath . Fishburne had approached Marvel about joining the MCU, pitching them a few ideas for whom he could portray, before Marvel offered him the role of Foster in the film . Despite having already portrayed Perry White for the DC Extended Universe, Fishburne said that he had always fantasized about being in an MCU film, admitting that he considered himself a "Marvel guy". Reed likened the rivalry between Foster and Pym to that of Steve Jobs and Bill Gates, and wanted an actor who can go "toe - to - toe" with Michael Douglas . Langston Fishburne, Laurence's son, stands in for a young Bill Foster . </Li>

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