This July, Earth's greatest heroes meet their most formidable foe yet ... an indifferent audience.

At least, that's the worry as DC and Marvel go head-to-head for summer blockbuster season's main event: Disney's "The Fantastic Four: First Steps" vs. Warner Bros.' "Superman."

To be fair, Garner's character is canonical — she plays Shalla-Bal, the female successor to OG Silver Surfer Norrin Rad. It still feels like Marvel is up to its old tricks.

Does the fate of the world hang in the balance? No, but the fate of Hollywood might.

After years of alienating moviegoers by prioritizing leftist virtue-signaling over entertainment, the industry hopes to put people back in the seats next month with some good, old-fashioned tentpole crowd-pleasers. And what better to lure them in than two big-budget exemplars of the genre that has dominated the multiplex for the better part of two decades?

Except that audiences have been showing signs of superhero fatigue in the last few years, raising worries that this much-ballyhooed showdown may turn out to be box office Kryptonite.

'Superman' (July 11)

When Warner Bros. hired James Gunn as co-head of DC Studios, the announcement was met with mixed feelings.

While many were excited for the "Guardians of the Galaxy" director to dip his toes in the world of DC after the successes of "The Suicide Squad" and "Peacemaker," some feared his signature humor and style would be a turnoff to mainstream audiences. Emotions on both sides intensified when Gunn announced he would be writing and directing the first movie of the post-Zack Snyder DCEU, "Superman."

Newcomer David Corenswet takes the reins from Henry Cavill as the Man of Steel, with Rachel Brosnahan as Lois Lane, Nicholas Hoult as Lex Luthor, and Nathan Fillion as Guy Gardner, a leading member of the Green Lantern Corps.

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David McNew/Getty Images

Multiple trailers have led to plenty of speculation — and with it, sparring. Detractors cite poorly received test screenings, as well as unconfirmed rumors that the plot revolves around Lex Luthor using social media to garner hate for Superman with the hashtag “#Supers**t."

One thing seems certain: Whatever some fans find to criticize about the new "Superman," it won't be political pandering. Having himself felt the wrath of cancel culture, Gunn seems dead set on appealing to as wide an audience as possible.

Commenting on the film's first teaser trailer, which features shots of a bruised and battle-weary hero, Gunn said,

We do have a battered Superman in the beginning. That is our country. ... I believe in the goodness of human beings, and I believe that most people in this country, despite their ideological beliefs, their politics, are doing their best to get by and be good people — despite what it may seem like to the other side, no matter what that other side might be.

This movie is about that. It’s about the basic kindness of human beings and that it can be seen as uncool and under siege [by] some of the darker voices [and] some of the louder voices.”

Considering how vocal Gunn has been about his disdain for Donald Trump in the past, it’s refreshing to see the director offer signs that his movie will let viewers leave their differences at the door.

Fans of this new take have praised the performances, bright color palette, and a tone that feels more in line with the iconic 1978 Christopher Reeve-led "Superman." Will "Superman" save the industry? Strong pre-ticket sales suggest it has enough wind under its cape to soar well above Hollywood’s expectations.

'The Fantastic Four: First Steps' (July 25)

"The Fantastic Four: First Steps" looks to continue the goodwill earned by this spring's "Thunderbolts*," which opened to high praise from audiences and critics alike despite disappointing box office.

After underwhelming iterations of Marvel's first family in 2005 and 2015 (the less said about the unreleased 1994 version, the better), the studio is hoping the third time's the charm.

Starring Pedro Pascal as Mr. Fantastic/Reed Richards, Vanessa Kirby as Invisible Woman/Sue Storm, Joseph Quinn as Human Torch/Johnny Storm, and Ebon Moss-Bachrach as The Thing/Ben Grimm, "The Fantastic Four: First Steps" features the team going up against one of Marvel’s most feared villains: Galactus, the devourer of worlds.

If that will appease traditionalists, the gender-swapping of beloved Marvel mainstay the Silver Surfer (Julia Garner) is bound to raise eyebrows — and attract more sniping at the "M-SHE-U."

To be fair, Garner's character is canonical — she plays Shalla-Bal, the female successor to OG Silver Surfer Norrin Rad. Point taken, but it still feels like Marvel is up to its old tricks.

Comments by producer Grant Curtis earlier this month certainly don't help matters.

“If you do go back through the comics," said Curtis, "you realize that Sue Storm is arguably the leader of the Fantastic Four, because without Sue Storm, everything falls apart.”

Many fans will be quick to point out the obvious: Mr. Fantastic has always been portrayed as the leader, with Invisible Woman taking on a more motherly role. For his part, however, Pedro Pascal doesn’t seem to mind being sidelined. In fact, he seems to welcome it.

I love being led in a way. What you may identify as generosity for me, it just isn't. I'm only inspired by … I guess just powerful women have been the thing that has gotten me through being alive. So to have the opportunity to stand by one, to learn from one — just a partner, it's partnership; it’s male and female, but it's also just a kind of transcendent sort of partnership in the work and in the characters. And so I don't really know what the f**k I'm gonna do without you [Vanessa] honestly,".

In addition to flaunting his "male feminist" bona fides (and giving fans the "ick" with his awkward shows of affection toward Kirby), Pascal has also drawn negative attention with his outspokenness on immigration policy. None of this has won over those for whom Pascal is simply and profoundly miscast as Reed Richards.

Worse, rumors that stars including Adam Driver, Jake Gyllenhaal, Christopher Abbott, and Jamie Dornan passed on the role before it went to Pascal suggest that it's the script's revisionist portrayal of Mr. Fantastic that is the problem — despite director Matt Shakman's insistence that he has looked to the original comics for inspiration.

That inspiration is certainly evident in the film's setting, a futuristic 1960s alternate reality that nicely pays homage to the original vision of "Fantastic Four" creators Stan Lee and Jack Kirby. Pascal aside, the casting of "Fantastic Four" promises a satisfying adaptation, as does the comic-book-accurate appearance of Galactus (Ralph Ineson) — a far cry from the cloud-like space cluster depicted in 2007 sequel "Fantastic Four: Rise of the Silver Surfer."

While "First Steps’" pre-sales trail behind those of "Superman," they're impressive enough for Marvel to be optimistic.

Of course, no amount of hype, armchair producing, or post-credits "Avengers: Doomsday" teases can turn either of these movies into a hit. That power remains squarely with us: the audience.

In that spirit, which of these two movies are you looking forward to seeing? Or will you be forgoing superheroics altogether in favor of the seventh "Jurassic Park" movie? Let us know in the comments below.