Answer
The answer is "X-Men: First Class." Singer served as a co-writer and co-producer for the 2011 superhero film directed by Matthew Vaughn. It is the fifth installment in the X-Men film series and features an ensemble cast including James McAvoy, Michael Fassbender, Rose Byrne, Jennifer Lawrence, and Kevin Bacon. Singer would later direct the following installment, X-Men: Days of Future Past.