A new trailer for Marvel Animation's "What If...?" just dropped, and the Marvel Cinematic Universe is about to change forever. With the release of "Deadpool & Wolverine," the MCU has finally collided with the X-Men franchise after years of teasing.

The third and final season of the Marvel Studios animated series will ponder such questions as: What if Storm of the X-Men wielded Thor’s hammer Mjolnir as the Goddess of Thunder? What if Sam Wilson’s Captain America assembled the A.V.E.N.G.E.R., Earth ...