The second installment of the fifth and final season of Stranger Things began with “The Vanishing of Holly Wheeler,” but those episodes were really the arrival of Nell Fisher. In a large, familiar ensemble, the 14-year-old British actress has burst on the scene as a driving force of the Netflix phenomenon’s swan song. The little sister of Mike (Finn Wolfhard) and Nancy Wheeler (Natalia Dyer) was essentially a background character for the first four seasons, being played by twins Anniston and Haisley Price. But, surprisingly, creators Ross and Matt Duffer had grander plans for Holly in season five, and so they conducted an extensive search for a new performer to take over the role, eventually landing on Fisher, who starred in the 2023 supernatural horror film Evil Dead Rise. “It was quite difficult, because she is a preexisting character that the fans know, and so I wanted to both do her justice to the fans but also make her my own character,” Fisher tells The Hollywood Reporter. “I actually met with the Price twins, and …