Dark Phoenix opened on Friday (7 June) to $14 million in the United States and took just $33 million across the weekend.
Dark Phoenix has collapsed at the box office, with the latest instalment in the X-Men series expected to lose between $100 million to $120 million.
The previous worst opening for an X-Men film in the United States was The Wolverine, which took $53 million in 2013, closely followed by X-Men: First Class, at $55 million in 2011.
According to Deadline, Dark Phoenix is expected to lose between $100 million to $120 million when all costs are added up.