Christopher Nolan isn't happy 'Barbie' will premiere the same weekend as his film, 'Oppenheimer,' sources say

• "Oppenheimer" and "Barbie" are both being released on July 21. 
• Nolan's complicated history with Warner Bros., the studio behind the pink-filled film, could be partly responsible.
• Sources told Insider that Nolan was upset WB will release "Barbie" the same weekend as "Oppenheimer."

On the surface, the release of "Oppenheimer" and "Barbie" on the same weekend seems to be due to an overcrowded summer movie season, resulting in a playful box-office battle that the internet has dubbed "Barbenheimer."

The reality, though, is a little more complicated, and has to do with "Oppenheimer" director Christopher Nolan's recent skirmish with Warner Bros., the studio releasing "Barbie."

For most of his career, Nolan released his movies through Warner Bros. Starting with 2002's "Insomnia," they include some of his most beloved titles like "Inception," "Dunkirk," and his "Dark Knight" trilogy.

But all that changed soon after the studio released his 2020 film "Tenet" exclusively in theaters at the height of the pandemic. When then-parent company WarnerMedia made the shocking decision in late 2020 to release its 2021 slate exclusively on its streaming service, HBO Max, Nolan lambasted the move.

"Some of our industry's biggest filmmakers and most important movie stars went to bed the night before thinking they were working for the greatest movie studio and woke up to find out they were working for the worst streaming service," Nolan said in a statement to The Hollywood Reporter in December 2020.

Then, in September 2021, Deadline broke the news that Nolan would be making his next movie, on atomic bomb creator J. Robert Oppenheimer, at Universal.

As theatrical release dates began to fill the 2023 calendar, "Oppenheimer" was slated for July 21 — not a surprise, given that mid-July has been Nolan's preferred release week for all his films since 2008's "The Dark Knight (save for "Interstellar," which opened in November; "Tenet" would have also opened in mid-July if it weren't for the pandemic).

But suddenly a new title also showed up on that date: Warner Bros.' long-in-development "Barbie" movie.

Was this a coincidence or was this Warner Bros. enacting some form of payback on Nolan? Would Warner Bros. be so petty that it would purposely attempt to undercut the auteur that used to be a star in its stable?

I had to ask Nolan himself.

Sources say Nolan was upset that "Barbie" would be released the same weekend as "Oppenheimer"

"Have you seen 'Barbie' yet?" I asked Nolan, while he was doing press for "Oppenheimer."

"No," he said. It was a curt response that gave a hint of disinterest.

I told him my theory that "Barbenheimer" was born through the complex history he has with Warner Bros.

"Now, you must know I'm not going to answer that question," he said with a chuckle, "only to say those who care about the theatrical experience, we've been longing for a crowded marketplace with a lot of different movies. That's what theaters have now and those of us who care about movies are thrilled about that."

Four sources familiar with the matter said Nolan wasn't nearly as diplomatic in his stance behind the scenes. They told Insider he was upset that Warner Bros. dated "Barbie" the same weekend as "Oppenheimer," especially since mid-July has been known in the movie business as "Nolan's weekend" for years. (The sources didn't authorize Insider to use their names as they didn't have the authority to speak on the matter publicly.)

There was even an attempt by the movie theater community, in which Nolan is beloved, to convince Warner Bros. to move the release date of "Barbie." But two of our sources said the studio wouldn't budge. (Insider contacted Warner Bros. for comment on this story, but did not receive a response.)

The showdown between "Oppenheimer" and "Barbie" is rare because studios typically want to keep their big releases away from other major titles, as opening on the same weekend could result in fewer box office dollars for both.

But clearly, Warner Bros. feels "Barbie" is up for the challenge. The studio has blitzed the public with promotion for months: First came the on-set shots of Margot Robbie as Barbie and Ryan Gosling as Ken dressed in matching rollerblade outfits. Then came the instantly-memed character posters, and stories about "pink days" on set, and the film contributing to an international shortage of pink paint.

Meanwhile, Universal has stayed surprisingly quiet with "Oppenheimer." Outside of revealing a countdown clock and ominous trailers featuring star Cillian Murphy, there hasn't been much information out there about the movie (most people are shocked when I tell them Florence Pugh is in it).

Awareness will increase soon — Universal held a press junket for "Oppenheimer" in New York City this past weekend — but is it too late? Early box office forecasts predict "Barbie" will open around $80 million in its first three days, with "Oppenheimer" taking in only $40 million.

Now here's the crazy part: Warner Bros. wants Nolan back!

Despite all this, don't be surprised if Nolan returns to Warner Bros.

In June, Variety reported that the new heads of Warner Bros., Michael De Luca and Pam Adby, want Nolan to return. The magazine reported that they sent the director a seven-figure royalty check for "Tenet" in an attempt to extend an olive branch.

On top of all that, I've been told by a source that Nolan and his wife and producing partner, Emma Thomas, still have an office on the studio lot.

After all this, could Nolan really go back to Warner Bros.? Some sources tell me a decision to return will be less about "Barbenheimer" and more about the respect Nolan and Thomas have for De Luca and Adby.

But Universal head Donna Langley isn't going to give up Nolan without a fight, either. (Insider contacted Universal for comment on this story but did not receive a response.)

As many moviegoers happily plan a "Barbenheimer" double-feature (I suggest seeing the intense, three-hour "Oppenheimer" first, and then finishing with the fun "Barbie"), Nolan will have to begin soul-searching to decide his best path forward.

And if recent history has taught us anything, we shouldn't be shocked by decisions made in Hollywood. If Dwayne Johnson and Vin Diesel can work together again, don't be surprised if Nolan and Warner Bros. patch things up.