PEOPLE has the exclusive First Look trailer atZombies 3ahead of its July 15 release — and the Disney+ film already looks out of this world!

“[This film] is something so different than [anything] we’ve ever done,” Donnelly, 21, tells PEOPLE exclusively.

As the third film makes the move fromDisney Channel to Disney+, she adds thatZombies 3feels much more like a feature film: “The way the shots are, the music numbers, everything is just bigger and better and more mature.”

John Medland/Disney

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While the film has some exciting new surprises in store, one thing fans can count on is another incredible soundtrack, including a new rendition of Zed and Addison’s popular duet “Someday.”

“[It was] so emotional,” Donnelly says of recording the new version of the song. “The original ‘Someday’ I sound so young because I was 16. So I have almost a time capsule of how we progress through each year. I filmed my part on the last day of filming so I was crying all day.”

That said, Donnelly teases that another duet with Manheim, 21, on theZombies 3soundtrack ranks as her “favorite song in theZombiesuniverse.”

“It has very similar ‘Someday’ energy,” she says of the new track. “I love when Zed and Addison are happy and just playing off each other and being goofy and silly. It was so much fun to film, especially with Milo.”

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In addition to Donnelly and Manheim, the upcoming film brings back Chandler Kinney as Willa, Ariel Martin as Wynter, Pearce Joza as Wyatt, Carla Jeffery as Bree, Trevor Tordjman as Bucky, Kylee Russell as Eliza, James Godfrey as Bonzo and Kingston Foster as Zoey.

The movie also adds a handful of new cast members as the extraterrestrial beings, includingRuPaulas the voice The Mothership, Terry Hu as A-spen, Kyra Tantao as A-li and Matt Cornett as A-lan, the latter of whom is also set to star opposite Donnelly inthe upcoming third season ofHigh School Musical: The Musical: The Series.

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“It was so amazing,” Donnelly says about working with Cornett on both projects. “When we filmedHigh School Musical, most of our scenes were together so that was really cool. It was so easy and so comfortable and we actually got so much closer on theHigh School Musicalset. It was really weird not seeing him in a blue wig, but nonetheless, it was great.”

BetweenZombiesandHSMTMTS, Donnelly admits its “surreal” to now be part of two iconic Disney franchises. “High School Musicalis the reason why I even started musical theater or acting,” she says. “The fact that’s even a possibility [to be part of theHSMfranchise] is just wild and I’m so honored. I still don’t believe it sometimes.”

Sheryl Nields/Disney

HIGH SCHOOL MUSICAL: THE MUSICAL: THE SERIES - Disney’s “High School Musical: The Musical: The Series” stars Joshua Bassett as Ricky, Sofia Wylie as Gina, Matt Cornett as E.J., Julia Lester as Ashlyn, Dara Reneé as Kourtney, Frankie Rodriguez as Carlos, Saylor Bell Curda as Maddox, Adrian Lyles as Jet, and Meg Donnelly as Val.

While Donnelly teases thatZombies 3ties up the franchise with “an amazing bow,” she is always open to reprising her role as Addison in the future.

“I would love to be a part of theZombiesfranchise for as long as possible,” she says. “I love playing Addison and this story has changed my life.”

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Zombies 3premieres July 15 on Disney+.

source: people.com