Scarlett Johansson is suing Disney for breach of contract after it streamed her superhero film Black Widow at the same time as its cinema release.
The film set a box office record for the Covid-19 pandemic, grossing $218m (£157m) in its first weekend.
But box office receipts then fell sharply and Ms Johansson argues she was deprived of potential earnings.
In response, Disney said it had “fully complied” with her contract and that her case had “no merit whatsoever”.
Ms Johansson said she was promised by Marvel Studios, which is owned by Disney, that Black Widow would be a “theatrical release”.
She said she had understood this to mean a “window” of time would pass before it would be streamed – a period that has traditionally lasted 90 days.
During the pandemic a number of Hollywood studios opted to bypass cinemas, many of which had been closed, and release their films online instead.
Now that most cinemas have reopened, Disney, along with fellow giant Warner Bros, has chosen to maintain a dual release strategy for their major films.
On its first weekend, Black Widow took some $80m in ticket sales in North America and $78m internationally, plus at least $60m in Disney+ Premier Access rentals.
Sources close to the actor, whose salary was based on the box office performance of the film, project that she lost $50m, according to media reports.
Disney countered by claiming that the dual release strategy had “significantly enhanced [Johansson’s] ability to earn additional compensation on top of the $20m she has received to date”.
In a strongly worded statement, it said her legal action was “especially sad and distressing in its callous disregard for the horrific and prolonged global effects of the Covid-19 pandemic”.
‘A real bait and switch’
Before the pandemic, Hollywood film fans would typically have to watch new releases at the cinema or wait three months to have them streamed to their devices.
Major studios have recently been mixing cinema releases and streaming in different ways as cinemas battle to win back viewers wary of catching the virus in confined spaces.
Yet the move has not proved popular with some of the film industry’s leading talents, among them Tenet and The Dark Knight director Christopher Nolan.
Last year the British film-maker criticised Warner Bros over its plans to release major movies on HBO Max, describing the situation as “a real bait and switch”.
“Warner Bros had an incredible machine for getting a film-maker’s work out everywhere, both in theatres and in the home, and they are dismantling it as we speak,” he told the Hollywood Reporter.
“Their decision makes no economic sense and even the most casual Wall Street investor can see the difference between disruption and dysfunction.”
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