These days, it feels like almost every new series has to kick off a franchise or inspire a host of spin-offs in order to justify its existence. Prime Video’s The Boys spawned Gen V, as well as an animated anthology, Taylor Sheridan‘s Yellowstone has grown the Dutton dynasty through two prequel shows to date, and we probably wouldn’t have Elsbeth on CBS without The Good Wife or The Good Fight. When the Russo Brothers‘ Citadel initially premiered in 2023, it was confirmed as an “international event series,” with spin-off shows planned in settings ranging from the Italian Alps to Mexico. Citadel: Diana, which dropped last month, further develops the Spyverse, with the bulk of the story featuring Matilda De Angelis‘ titular heroine set between Seasons 1 and 2 of the flagship show.