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)