Los Angeles - Monsters University - a prequel to Pixar's 2001 hit Monsters, Inc - buried Brad Pitt zombie flick World War Z and took the top spot at the US box office, provisional figures showed on Sunday.
The animated movie that tells how monster buddies Mike and Sulley became friends and honed their scaring skills took in $82, compared to just $66m for the apocalyptic blockbuster, on their opening weekend.
Superman reboot Man of Steel dropped to third, bringing in $41m after opening in the top slot last weekend with earnings of $116.6m.
Coming in fourth was This is the End, an apocalyptic comedy starring Seth Rogan and James Franco, which brought in $13m, according to figures from industry tracker Exhibitor Relations.
Iron Man 3 still going
Sleeper hit Now You See Me, about an FBI agent and an Interpol detective who hunt down a team of illusionists performing bank heists during their shows, came in fifth with $7.9m.
Action sequel Fast & Furious 6, starring Vin Diesel and Michelle Rodriguez, added another $4.7m, taking its outright haul to $228m and putting it in sixth place.
In seventh was the Vince Vaughn and Owen Wilson comedy The Internship, which sees the Wedding Crashers co-stars competing with tech wizards after scoring an internship at Google. The film took in $3.4m.
Low-budget horror film The Purge - which scored a surprisingly strong opening two weeks ago to top the box office - fell to eighth place with $3.4m.
However, the $3m Universal feature starring Ethan Hawke and Game of Thrones star Lena Headey has now earned a total of $59m, with a sequel already in the works, according to industry reports.
Summer blockbusters Star Trek: Into Darkness and Iron Man 3 rounded out the top ten, bringing in $3m and $2.2m, respectively. Iron Man 3 has made more than $400m since its release two months ago.