Moon Knightfeatures the talents of not just actor Oscar Isaac, but also his brother, who went by a rude nickname during the show's filming. The Marvel series on Disney+ centers on a superhero with Dissociative Identity Disorder (DID), which causes him to take on various alters. Moon Knight's identities are primarily split between the bumbling museum worker, Steven Grant, and ruthless mercenary, Marc Spector. The two are constantly at odds, with Marc seemingly having better control over the character's superpowers granted by the Egyptian god Khonshu. After avoiding one another for some time, Steven and Marc eventually find themselves interacting and even working together, conversing through mirrors, puddles of water or anywhere a reflection can be found.
In an effort to capture the most authentic portrayal of Marc's personalities in Moon Knight, Isaac looped in his younger brother, Michael Benjamin Hernandez. Throughout the production, Hernandez served as Isaac's body double, performing lines as either Marc or Steven while the other brother played the alter. Hernandez not only acted but also underwent a physical transformation as well, dieting and training alongside Isaac in order to mirror his brother's MCU superhero physique in Moon Knight.
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Another key element to Hernandez's transformation was the use of makeup and prosthetics. In an interview with Marvel.com, Hernandez said he underwent a face casting process and wore a fake nose fashioned to look like Isaac's. Hernandez's version of Marc Spector even went by a clever code name: «Mork Sphincter.» Read his comments below:
“It was just this weird, mutated abomination of Marc with a fake prosthetic nose. I had never done
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