Dec. 6 (UPI) -- There's no stopping the X-Men franchise.
X-Men: Days of Future Past won't hit theaters till May of next year, but director Bryan Singer is already plotting the next installment.
He issued this not-so-cryptic tweet on Thursday afternoon:world's oldest mutant, En Sabah Nur, who first appeared in the X-Men spinoff, X-Factor, back in 1986. He's considered one of the most formidable X-Men opponents.
EW confirmed Thursday that 20th Century Fox titled the film X-Men: Apocalypse and had it slated for a May 27, 2016 release date.