Answer
Superhero films became Singer's specialty during the 2000s. He garnered acclaim for revitalizing the Superman film franchise with "Superman Returns" (2006), which showcased the iconic superhero's return after a lengthy absence from the big screen. Singer also helmed the critically and commercially successful "X-Men" films, bringing the popular Marvel Comics mutant team to life in a groundbreaking manner that set the standard for future superhero adaptations.