Nicholas Galitzine

Adam / He-Man

Camila Mendes

Teela

Idris Elba

Duncan

Jared Leto

Skeletor

Alison Brie

Evil-Lyn

Jóhannes Haukur Jóhannesson

Fisto

Jon Xue Zhang

Ram Man

Sam C. Wilson

Trap Jaw

James Purefoy

King Randor

Charlotte Riley

Queen Marlena

Morena Baccarin

The Sorceress

Kristen Wiig

Roboto (voice)

Tom Wilton

Cringer (voice)

Christiaan Bettridge

Dian

Artie Wilkinson-Hunt

Young Adam

Eire Farrell

Young Teela

James Wilkinson

Mekaneck

Dolph Lundgren

Macho Man

Kojo Attah

Tri-Klops

Hung Dante Dong

Karg

James Apps

Spikor

Hafþór Júlíus Björnsson

Goat Man

Arun Bassi

Pigboy

Christian Vunipola

Hussein

Sasheer Zamata

Suzie

Max Kraus

Officer Black

Kelly Coughlin

Officer Blumenthal

Elena Rivers

Julie

Stephen Adentan

Moss Man

Michael Bijok

Castle Guard

Everleigh Brenner

Guard (Subternia)

Emma Mulkern

Co-Worker

Elliott Culpepper

Co-Worker

Dylan Zalikowski

Co-Worker

Michelle Schechter

Palace Servant

Chanelle Nicole

Palace Servant

Susie Coutts

Royal Guard

Eddison Burch

Garda (Bailey Training)

Arthur Galiano

Darid (Bailey Training)

Aaron Lynn

School Teacher

Delilah O’Riordan

Young Dian

Callum Burns

Nerd

Devonté Sackitey

Nerd

Mark Conway

Nerd

Connor Crawford

Sword Nerd

Richard David-Caine

Fanboy

Olivia Marcus

Comics Store Clerk

Billy Clements

Prisoner (Dungeon)

Piotr Michael

Ship (voice)

Christopher Ragland

Orko (voice)

Fletcher Glenn

Cringer Cub (voice)

Gary Martin

Beast Man (voice)

Lauren Saliu

Adora / She-Ra (uncredited)

Charlie Jimenez

Dog Man (uncredited)

Kellen Goff

Goat Man (voice) (uncredited)

Justin Yau

(uncredited)