X-Men Join Avengers: Doomsday Teaser Confirms Epic MCU Crossover!

• New teaser for "Avengers: Doomsday" reveals X-Men characters officially joining the Marvel Cinematic Universe.
• Dr. Charles Xavier (Patrick Stewart), Magneto (Ian McKellen), and Cyclops (James Marsden) make their MCU debut.
• The crossover fulfills long-standing fan anticipation following Disney's acquisition of 20th Century Fox.
• "Avengers: Doomsday" is positioned as a major event film, shaping the next phase of interconnected MCU storytelling.
• Scheduled for release on December 18, the teaser has successfully fueled fan theories and online discussions.

Why It Matters: X-Men officially join MCU in 'Avengers: Doomsday' teaser, promising a massive crossover.