For years now, one question has quietly hovered over every new MCU announcement, teaser, and casting reveal: Why does ‘Avengers: Doomsday‘ feel so different from every Avengers movie that came before it?

Patrick Stewart, Ian McKellen and James Marsden reprise their X-Men roles in the latest teaser for 'Avengers: Doomsday,' which Marvel Studios rolled out on Jan. 6. Previous mini-teasers released for the movie showcased Chris Evans' return to portraying Steve Rogers and Chris Hemsworth in his role as Thor.

Outside of their superhero work, the two have re-teamed with the Avengers. They worked with Tom Holland, who played Spider-Man, on the movie Cherry, with former Captain America Chris Evans on the thriller The Gray Man, and with Guardians of the Galaxy ’s Chris Pratt on the Netflix movie The Electric State.

According to a recent report, an unexpected MCU character will have a role in Avengers: Doomsday, which arrives later this year.

The MCU has released four Avengers movies thus far, but which is the most thrilling, offering the right balance between scope and sheer excitement?