Bryan Singer joined Instagram by debuting the first photo of the official "X-Men: Apocalypse" script.

The small teaser of the script revealed the Four Horsemen scene at the end of "X-Men: Days of Future Past" could be returning in the next installment. There is also mention of the Nile, a river found in Egypt.

The Ancient Egypt setting at the end of "Days of Future Past" was the first time fans caught a glimpse of Apocalypse, who is one of the most dangerous mutants to walk Earth.

However, the script teased is only a "treatment" and many things could change up until the film's U.S. release May 27, 2016. Singer's return for "X-Men: Apocalypse" wasn't confirmed by FOX.

In a recent interview with The Hollywood Reporter, FOX President of Production Emma Watts claimed the production was in the "outlining" process, but couldn't confirm if Singer would return to the franchise. Watts claimed she would be "happy" to see Singer back for "X-Men: Apocalypse"

Watts' comments came of the heels of FOX's "X-Men: Days of Future Past" earning more than $700 million at the box-office during its run in theaters. The film premiered in the U.S. on May 23.

"It was the management of the franchise. And a big part of it was getting Bryan [Singer] back [as director]," she told THR. "The debate about originality versus familiar titles is interesting. You can have original movies that feel derivative in their execution, and you can have franchise titles that feel solely original and aspirational in terms of the talent attached, the story, et cetera. So I think the reason for Days of Future Past's success is, it doesn't underestimate what the audience is wanting or capable of enjoying."

"X-Men: Apocalypse" will star Jennifer Lawrence, Michael Fassbender, James McAvoy, Evan Peters, Nicholas Hoult and more.