New Mutants' Synopsis Mentions Colossus

Disney has released an extended and updated New Mutants synopsis which happens to reference the X-Men, Colossus, who is the brother to Magik, played by Anya Taylor-Joy.

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Uncanny X-Men #496 Review - Comic Book Revolution

New Mutants Vol 1 73, Marvel Database

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The New Mutants: THIS Character Has Been Confirmed As The Sister Of Colossus

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139: Excalibur V1 #91-95 (Colossus)

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Magik (New Mutants) Character Profile – The Comic Book Sanctum

New Mutants, Generation X, Academy X, & other young X-Men - Reading Order & Comic Book Collecting Guide – Crushing Krisis