En Sabah Nur summons the Four Horsemen in the latest trailer for director Bryan Singer's "X-Men: Apocalypse." However, it's not the villain's allies or even Mystique's rallying of the young mutants that will most interest fans, but rather confirmation of an expected -- but still much-anticipated -- cameo.

Here's a hint: SNIKT!

W. pic.twitter.com/afhMx2ELnr- Hugh Jackman (@RealHughJackman) April 25, 2016

The sequel to 2014's "X-Men: Days of Future Past" introduces the immortal Apocalypse, the first and most powerful mutant, who has been worshiped as a god since the dawn of civilization. Awakening after thousands of years, he's disillusioned with the world he sees, and recruits a team of powerful mutants -- including Michael Fassbender's Magneto -- to cleanse mankind and create a new world. As the fate of the Earth hangs in the balance, Raven (Jennifer Lawrence), with the help of Professor X (James McAvoy), must lead a team of young X-Men to stop their greatest enemy and save mankind.

Opening May 27 in the United States, "X-Men: Apocalypse" also stars Oscar Isaac, Nicholas Hoult, Rose Byrne, Tye Sheridan, Sophie Turner, Evan Peters, Alexandra Shipp, Kodi Smit-McPhee, Olivia Munn, Lana Condor and Lucas Till.