“Ghostbusters: Frozen Empire” stars Finn Wolfhard and Mckenna Grace dished with “Extra’s” Mona Kosar Abdi on continuing the franchise. Finn teased that Trevor is “more of a key player” in the Ghostbusters this time around, while Mckenna said Phoebe struggles after getting ghostbusting taken away from her. Finn also spoke about filming the fifth and final season of “Stranger Things” and how emotional that is. “Ghostbusters: Frozen Empire” is out March 22.