When director Sam Raimi boarded the Doctor Strange sequel In The Multiverse of Madness, excitement spread across the Marvel Cinematic Universe. The director of the first Spider-Man trilogy from the early aughts is a master at blending delirious action set pieces and a touch of darkness, delivering the kind of superhero cinematic experience that elevated the entire genre. A new featurette reveals just how much Raimi got to sink his teeth into In The Multiverse of Madness as Doctor Strange (Benedict Cumberbatch) is set to face not only his own demons (quite literally), but an entire multiverse of characters good and evil. The new film will fully unleash Marvel’s Phase 4, setting up new stakes, new characters, and a new direction for the vaunted mega-movie franchise house.

“It’s pretty unfathomably exciting where we’re going in this film,” Cumberbatch says at the top of the brand new featurette. “It’s the most fantastic new phase of Marvel.” In Doctor Strange in the Multiverse of Madness, Strange will be teaming up with Wanda Maximoff (Elizabeth Olsen), one of the most powerful Avengers of them all, and something of a troubled case after the events in WandaVision, when she set up an alternate reality in the Hex to try and trap a version of Vision (Paul Bettany) in a suburban idyll, be damned the actual people who lived in the town of Westview, New Jersey.

“In this story, we are leaping into different universes, but unlocking the multiverse creates a big Pandora’s box,” says Olsen. Wanda and Strange will try to contend with the unleashed contents of that Pandora’s box, which include monsters, villains, and an evil version of Strange himself.

“We’re in unknown territory. I think audiences are going to be startled,” says Benedict Wong, who returns as Strange’s right-hand man, Wong. “These other realities invite a plethora of all these new characters.”

“It had to be large because had to not only paint a picture of our universe but multiple universes,” Sam Raimi says. “It was a great opportunity to pair two of the most powerful superheroes together.”

Joining Strange, Wanda, and Wong are Xochitl Gomez as superhero America Chavez, Rachel McAdams as Dr. Christine Palmer, Patrick Stewart returning as Charles Xavier, and Chiwetel Ejiofor returning as Mordo.

Check out the epic new featurette below. Doctor Strange in the Multiverse of Madness hits theaters on May 6.