"X-Men: Apocalypse" director Bryan Singer has opened up about the visual and auditory decisions he made for the titular big bad of the film, clearing up his intention for the character's changing look and voice over the course of the movie.

Singer discussed Oscar Isaac's Apocalypse voice with IGN, revealing that he always planned to use the actor's real voice in the first teaser, despite it not being used through the entire film: "[The first 'X-Men: Apocalypse' trailer] was simply Oscar using his normal voice -- which is wonderful; his performance is fantastic -- but that was never the intention. We just needed those words to govern the first teaser. So people thought, 'Oh, wait, is that going to be his voice during the whole movie?' It's like, no, but to tell the story of the first teaser, we needed the voice, and I hadn't recreated the voice yet."

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He added, "It ebbs and flows and moves through the movie, and changes, so he doesn't just have one single voice. He speaks with different voices depending on different moments in the film. So it's really kind of cool. It's the first time I've ever had the tools to sculpt a performance in post-production, that was already given to me on set and chosen in the cutting room."

The "X-Men: Days of Future Past" helmer then addressed the look of Apocalypse, and how the first photo released of the character didn't correctly capture his color in the film: "There was an image released on Entertainment Weekly, where the effect hadn't been put in yet, so everyone was -- the effect has a pink light on it, and everyone got lit up pink, so people thought Apocalypse was going to be pink. I was like, 'No, no, they're all pink. Take a look. Everyone in the picture is pink. It's a pink picture.' They maybe just should have taken the pink out of the picture -- I should have taken the pink out of the picture. I'm going to take some blame for that. My fault, not Entertainment Weekly's. That's the picture I gave them."

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As for the villain's size -- which has caused controversy because he appears considerably smaller in some scenes than he does in the comics -- Singer explained that Apocalypse's height varies over the course of the film: "So then people were like, 'He's small.' I'm like, 'Okay, I got the same s*** when I cast a six-foot-three actor to play five-foot-four Wolverine. I got the same s*** when Quicksilver's very sweet, 1970s costume was released on an Empire Magazine cover.' You know, every time. I could have made him a giant through the whole movie, or some muscle-bound guy who can't act -- I could always do that. But the reality is, among his many powers -- and you will see him change size -- but among his many powers is his power of persuasion, and it was very important that he'd be able to connect with his horsemen, at their level, and that he'd be played by a guy who can actually act like Oscar, who's a fantastic actor."

"X-Men: Apocalypse" hits theaters on May 27.