Cast
David Corenswet as Kal-El / Clark Kent / Superman:A survivor from the destroyed planet Krypton who lives on Earth as a powerful superhero. He maintains a separate identity at his day job, working as a journalist for the Daily Planet in Metropolis.
Nicholas Hoult as Lex Luthor:The former CEO of LuthorCorp and Superman's arch-nemesis who is incarcerated in Van Kull Prison. After exploring "a lot about the evil part of Lex" in the DC Universe (DCU) film Superman (2025), writer and director James Gunn was interested in "getting into the heart of Lex, and... getting to know Lex as more of a human being". He admired the character's tenacity and ambition, particularly as a human with no superpowers who chooses to challenge a powerful alien. The film features Luthor's high-tech powered exoskeleton Warsuit, which he uses to match Superman's strength, for the first time in a live-action film.
Rachel Brosnahan as Lois Lane: A reporter for the Daily Planet who is Clark's girlfriend and colleague
Edi Gathegi as Michael Holt / Mister Terrific: A superhero and inventor who uses a variety of high-tech gadgets to fight crime, and is a member of the Justice Gang sponsored by Maxwell Lord
Nathan Fillion as Guy Gardner / Green Lantern:An abrasive galactic peacekeeper in the Green Lantern Corps, and a Justice Gang member. Fillion said the character's hairstyle was updated for Man of Tomorrow after he wore the same bowl cut wig for both Superman and the television series Lanterns (2026–present).
Isabela Merced as Kendra Saunders / Hawkgirl:A superhero with wings and various melee weapons who is a Justice Gang member. She is reincarnated from an alien, retaining her memories and past trauma with a grumpy demeanor.
Skyler Gisondo as Jimmy Olsen: A boyish young photographer who is Clark and Lois's closest colleague
Frank Grillo as Rick Flag Sr.: The director of A.R.G.U.S.
Sara Sampaio as Eve Teschmacher: Luthor's former assistant and girlfriend who is secretly involved with Jimmy
María Gabriela de Faría as Angela Spica / The Engineer: An ally of Luthor whose abilities come from nanotechnology in her body
Lars Eidinger as Brainiac:A superintelligent alien android from the planet Colu. Eidinger characterized Brainiac as "the incarnation of Satan" and the Shakespearean fool, contrasting him with Superman as the Übermensch. Gunn further contrasted Brainiac with Superman as "what happens when intelligence loses all connection to humanity". Gunn added that he had read most comic book storylines featuring Brainiac and incorporated aspects from various iterations of the character that he felt worked for this interpretation, drawing particular inspiration from the original version created by writer Otto Binder in the 1950s, the "surprisingly scary" version by writer Marv Wolfman, animated adaptations, and the "truly creepy and wonderful" artificial intelligence (AI) version from the Absolute Universe.
Aaron Pierre as John Stewart / Green Lantern: A member of the Green Lantern Corps
Milly Alcock as Kara Zor-El / Supergirl:The cousin of Superman who was raised on a chunk of the destroyed planet Krypton and watched everyone around her die, making her a more jaded person than her cousin, who was raised on Earth by loving parents. DC Studios executive Lars P. Winther said that Supergirl is now spending more time with her cousin on Earth following her "wild ways" in her intergalactic-set film, Supergirl (2026).
Xolo Maridueña as Jaime Reyes / Blue Beetle:A college graduate bonded to an alien Scarab that forms a powerful exoskeleton around his body. Maridueña reprises his role from the DC Extended Universe (DCEU) film Blue Beetle (2023).
Additionally, Adria Arjona has been cast in an undisclosed role, reported to be Maxima, the warrior-queen of the planet Almerac who believes Superman is her suitable mate. Other actors cast in undisclosed roles are Andre Royo, Matthew Lillard, and Sinqua Walls, while Neva Howell reprises her role as Martha Kent, Clark's adoptive human mother, and Stephen Blackehart reprises his DCU role as LuthorCorp employee Sydney Happersen.
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