There’s a Very Subtle Justice League Spoiler at the Beginning of Wonder Woman

Though Wonder Woman is an origin story, largely set during World War I, the movie begins with a modern-day Diana Prince (Gal Gadot) receiving a photograph in the mail. She sits down at her Paris office to examine the black-and-white picture. It shows her in full Wonder Woman regalia standing with Steve Trevor (Chris Pine) and the rest of their cohort in what appears to be a war-torn city. On the back is a note from Bruce Wayne, Batman himself.