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Anson Mount as Black Bolt
The Hell on Wheels star plays the show's lead role, "the enigmatic, commanding King of the Inhumans, with a voice so powerful that the slightest whisper can destroy a city." Showrunner Scott Buck notes: "Black Bolt is a character whose deep complexity must be conveyed without uttering a single word."
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Iwan Rheon as Maximus
Rheon (Game of Thrones) will portray Maximus, a "clever and charming Inhuman that is fiercely devoted to the people of Attilan, especially his brother, Black Bolt, though he harbors an intense desire to wear the crown himself." Marvel TV head Jeph Loeb notes: "Iwan’s ability to be charming, roguish, and still completely unexpectedly dangerous were all the different sides we needed to bring the character to life."
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Serinda Swan as Medusa
Swan (Ballers) is Black Bolt’s queen, who "has total control over her hair, letting her use it similar to how people move their hands."
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Ken Leung as Karnak
The Lost actor plays Karnak, whose "gift is an ability to see the fault in all things — people, plans, structures, everything. He’s Black Bolt’s most ardent supporter and strategist and is often seen as the royal family’s planner and philosopher."
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Eme Ikwuakor as Gorgon
Ikwuakor (Concussion) plays the cousin of Black Bolt (Anson Mount), "a member of the Royal family, and leader of Attilan’s military. With super strong legs, complete with hooves, he can generate destructive seismic waves with a single stomp. The ying to his cousin Karnak's yang, Gorgon would rather fight than talk to solve his problems."
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Isabelle Cornish as Crystal
Cornish stars as Crystal, Medusa’s sister. Crystal is "the youngest member of the royal family and has the ability to control the elements. Impetuous and independent she is also deeply devoted to her family."
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Mike Moh as Triton
The Empire actor plays Black Bolt’s cousin. "He’s calm under pressure and supremely athletic. His gift is his fish-like ability to live underwater."
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Sonya Balmores as Auran
Balmores (Beyond the Break) plays the Head of the Royal Guards on Attilan, "a capable and no-nonsense woman. She is fiercely loyal to the King of Attilan."
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Ellen Woglom as an undisclosed character
The Californication actress will play a secret role, described as "smart, intense, and focused -- so focused that oftentimes, social skills take a back seat. Her job at a private aerospace company is her life, second only to her passion for all things space and lunar. She’s primed to be swept up in an adventure."
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Lockjaw as himself
He’' Crystal's 2,000-pound bulldog, a fan favorite, and has the ability to teleport (which should come in handy, because cleaning up after a one-ton dog must get rather messy).