Munn has previously appeared as a host on Attack of the Show! and had minor roles on Chuck and in Iron Man 2.
Psylocke was created by Chris Claremont and Herb Trimpe in 1976 for Captain Britain and later integrated more fully into the X-Men universe. She's a model with powerful psychic powers and advanced martial arts training.
Apocalypse takes place a decade after Days of Future Past and is a seamless next step in the story. The altering of time has unleashed a new and uniquely powerful enemy. Charles/Professor X, Erik/Magneto, Raven/Mystique, and Hank/Beast are joined by young Cyclops, Storm, Jean and others as the X-Men must fight their most formidable foe yet – an ancient unrelenting force determined to cause an apocalypse unlike any in human history.
The film is due in theaters on May 27, 2016.