Even more mutants are joining the fold for "X-Men: Apocalypse," with director Bryan Singer revealing that another actress has been added to the cast.

In a post on Instagram, Singer said that Olivia Munn would be playing Betsy Braddock, a.k.a. Psylocke, in the flick. No other details about her character, including how prominently she would factor into the film's plot, were provided.

Excited to welcome @oliviamunn as Betsy Braddock! #Psylocke #XmenApocalypse #XMEN

A photo posted by Bryan Singer (@bryanjaysinger) on

Munn is just the latest in a long string of actors to join the "Apocalypse" ensemble, with Lana Condor (Jubilee), Sophie Turner (Jean Grey), Oscar Isaac (Apocalypse), and Kodi Smit-McPhee (Nightcrawler) all making their franchise debut. "X-Men" veterans Jennifer Lawrence, James McAvoy, Michael Fassbender, and Nicholas Hoult are all reprising their roles.

"X-Men: Apocalypse" is due in theaters on May 27, 2016.

[via: Bryan Singer]

Photo credit: AFP/Getty Images