The Marvel superhero pic tumbled 66 percent in its sophomore outing domestically, compared to a 53 percent drop for DC's 'Superman.'

Those are the worst examples of weekend-to-weekend collapses by MCU titles in the post- Avengers: Endgame era, and Fantastic Four: First Steps didn't perform THAT badly in the last three days... but the results are definitely disappointing.

First Steps has reached a pivotal point in its theatrical run as second-weekend numbers confirm a significant drop after its $117.6 million debut. Early estimates show a decline of more than 60%. The film now faces growing competition from new releases.