EXCLUSIVE: The Flight Attendant‘s Zosia Mamet has signed on for a role in S.J. Clarkson’s Sony Pictures film Madame Web, based on the Marvel comics by writer Denny O’Neil and artist John Romita Jr. She joins an ensemble led by Dakota Johnson, which also includes Sydney Sweeney, Isabela Merced, Emma Roberts, Celeste O’Connor, Tahar Rahim, Mike Epps and Adam Scott, as previously announced.