MAN OF TOMORROW Director James Gunn Close To Casting Brainiac - Here's Everyone Rumored For The Role So Far

MAN OF TOMORROW Director James Gunn Close To Casting Brainiac - Here's Everyone Rumored For The Role So Far

A new rumour suggests that James Gunn will cast Man of Tomorrow's Brainiac as soon as this week, and four actors are said to be in the running for the role.

By JoshWilding - Dec 09, 2025 05:12 AM EST
Filed Under: Man of Tomorrow

With so many established superhero franchises now in theaters or on streaming, there aren't too many big casting possibilities to get excited about. The DCU's Batman and the post-Avengers: Secret Wars X-Men are the big ones, as is Man of Tomorrow's Brainiac. 

According to scooper @MyTimeToShineH, "[A] casting decision for Brainiac is coming any day now." That could mean the news will hit the trades before the week is over, though we're sure James Gunn won't want it to overshadow the first Supergirl trailer

Several names have been rumoured for the role of Brainiac since we first learned that the filmmaker is looking to add one of Superman's most iconic, deadliest villains to Man of Tomorrow. Here's a reminder:

Dave Bautista

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Dave Bautista is a former WWE Champion who wrestled as Batista until retiring in 2019. He transitioned into acting several years before that, with Guardians of the Galaxy's Drax his most iconic role. Other noteworthy projects include Blade Runner 2049, Dune, Knock at the Cabin, and The Killer's Game.

Matt Smith

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From 2010 to 2013, Matt Smith portrayed the Eleventh Doctor in Doctor Who, earning a BAFTA nomination. In 2016, he played Prince Philip in Netflix's The Crown, receiving a Primetime Emmy nomination. Since 2022, he's played Daemon Targaryen in House of the Dragon and played the lead villain, Milo, in Morbius.

Sam Rockwell

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Sam Rockwell rose to prominence in the 1990s, with his breakthrough coming with The Green Mile and Galaxy Quest. He won the Academy Award for Best Supporting Actor for Three Billboards Outside Ebbing, Missouri, and counts Iron Man 2 and The Bad Guys franchise among his blockbuster credits. 

Claes Bang

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After working extensively in Danish theatre and television, Claes Bang's international breakthrough came in 2017 as Christian in Ruben Östlund’s The Square. He later played Dracula in the BBC series of the same name, and appeared in The AffairThe Northman, The Girl in the Spider’s Web, and Bad Sisters.

Written and directed by James Gunn, Man of Tomorrow stars David Corenswet as Clark Kent/Superman, Nicholas Hoult as Lex Luthor, Rachel Brosnahan as Lois Lane, Isabela Merced as Kendra Saunders/Hawkgirl, and Frank Grillo as Rick Flag, Sr.

Several actors and characters are rumoured to appear, including Aaron Pierre's John Stewart/Green Lantern and John Cena's Peacemaker. Recent reports have suggested Gunn is looking to cast the DCU's Wonder Woman, and while the filmmaker has remained silent on that, he did recently confirm that Steve Trevor won't appear in the Superman sequel.

Man of Tomorrow arrives in theaters on July 9, 2027.

About The Author:
JoshWilding
Member Since 3/13/2009
Comic Book Reader. Film Lover. WWE and F1 Fan. Rotten Tomatoes-approved critic and ComicBookMovie.com's #1 contributor.
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THEKENDOMAN
THEKENDOMAN - 12/9/2025, 6:01 AM
I like Smith, Rockwell and Bang.

I also like Dave, but him as Brainiac, I'm not feeling it.

It would be a [frick]ing different approach, have him speak to intellectual, etc, but I dont see him in this role.


When I think about it, I guess Bang will be the best choice from the three.

For [frick]s Sake
SpiderParker
SpiderParker - 12/9/2025, 6:08 AM
Batfleck was the real Brianiac.

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Thebronxknight
Thebronxknight - 12/9/2025, 6:24 AM
Bang A Rang for the win!
FallenThomas
FallenThomas - 12/9/2025, 7:08 AM
Smith or Rockwell, surely? I really like Bang but he's too sophisticated. The role needs a quirky, off kilter genius aura. That said, Gunn will probably cast his idiot brother.
FinnFangFoom
FinnFangFoom - 12/9/2025, 7:14 AM
Jim Carrey for Brainiac
China1975
China1975 - 12/9/2025, 12:46 PM
@RegularPoochie - that could actually probably be cool, just as long as not played for laughs
ZaphodDent42
ZaphodDent42 - 12/9/2025, 7:15 AM
Put rumour in the headline!!!!! I'm here for news! Not twitter hacks rumours!
TheRevelation
TheRevelation - 12/9/2025, 7:46 AM
They should just bring back the Snyderverse. Can't wait to see how that ends.

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DocSpock
DocSpock - 12/9/2025, 11:03 AM
@TheRevelation -

Wild thing, you make my heart sing.

TheVisionary25
TheVisionary25 - 12/9/2025, 7:54 AM
Cool , looking forward to seeing who it could be tbh…

In regards to the rumored choices , Bautista could be an interesting choice and would be somewhat different for him since he’s mainly done these more physical roles where this could allow him to flex his intelligence more which might be fun.

While I love Sam Rockwell , I can’t see him as Brainiac which leaves Claes Bang & Matt Smith…

Both can play intelligent & menacing characters well but I would go with Smith more since I feel he could convey the logical nature of Brainiac the best out of these actors!!.

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Obviously , this all depends on the characterization & take Gunn goes for so we’ll see.
Forthas
Forthas - 12/9/2025, 8:00 AM
Since the role requires a lot of prosthetics, I have a feeling the role will go to...James Gunn!
JackDeth
JackDeth - 12/9/2025, 8:44 AM
Watch the announcement be none of these. lol
TheVisionary25
TheVisionary25 - 12/9/2025, 8:48 AM
@JackDeth - I wouldn’t be surprised lol
bobevanz
bobevanz - 12/9/2025, 9:46 AM
I'm gonna have to start saving all the rumor recipts. These clowns must be called out!
soberchimera
soberchimera - 12/9/2025, 10:08 AM
Bang or Smith.
DocSpock
DocSpock - 12/9/2025, 11:04 AM

Matt Smith would be the best of that bunch.

ModHaterSLADE
ModHaterSLADE - 12/9/2025, 12:24 PM
Out of all of those Bang would be the best IMO, he's great at playing villains, especially Dracula.
Patient2670
Patient2670 - 12/9/2025, 1:40 PM
Of these, my choices would be either Matt Smith Or Dave Bautista. I think Dave's work in Blade Runner (both the movie and the short he did) shows that he can do the part, beyond just any physicallity.

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