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image via Marvel Marvel Studios just dropped the X-Men teaser trailer for Avengers: Doomsday, and it’s a big deal because the iconic mutants are finally making their grand entrance into the MCU. After being shown in theaters before Avatar: Fire and Ash and leaking online last week, this teaser is now officially out for everyone to see. Fans can finally get a good look at how the X-Men are going to fit into Marvel’s next big hit. The teaser brings back some fan-favorite charac