2018 saw two cameos in two very successful musicals. While fans had wished to see more of Donna Sheridan in the surprise sequel/prequel “Mamma Mia: Here We Go Again”, her appearance in the film was limited to one scene as Donna’s (at least singing) ghost, and of course an ensemble performance in the closing credits. Streep also reunited with Rob Marshall for the sequel “Mary Poppins Returns”, starring Emily Blunt and Lin-Manuel Miranda, in which she had one scene as Mary’s aunt Topsy.