"A lot of stunts she wanted to do herself, so she trained very heavily in martial arts and in sword fighting and all kinds of things," director Bryan Singer says in the clip.

Munn had never worked with swords before but devoted herself to the task, added boxing, tae kwon do and karate to her regimen.

"When I'm not on set, I have about six, six-and-a-half hours of a constant workout," says Munn.

Her work ethic was enough to impress fellow Apocalypse ally Michael Fassbender (Magneto), who says, "She's been working nonstop since she arrived."

Visual effects designer John Dykstra also sheds light on just how Psylocke's psionic blade functions. There are principles of science governing how it works, as he explains in the video.

X-Men: Apocalypse is available on Digital HD now and hits Blu-ray, 4K UHD and DVD on Oct. 4.