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Los Angeles - Transformers: The Last Knight smashed its way to the top of the North American box office, industry estimates showed on Sunday, sending last week's hit Cars 3 to second place.
The fifth instalment of the blockbuster franchise took in $45.3m in its opening weekend but opened to a franchise low - the first Transformers movie not to premiere to $100m or more.
The visual-effects heavy film features actors Mark Wahlberg, Josh Duhamel, John Turturro and Anthony Hopkins.
Speeding into second was the third instalment in Pixar's Cars franchise, with $25.2m in its second weekend.
The animated flick features Lightning McQueen and his long-time friends fighting off a challenge from a new generation of racers, voiced by stars including Owen Wilson, Cristela Alonzo and Armie Hammer.
Superhero film Wonder Woman narrowly fell to third place with $25.1m in earnings.
The action film starring Gal Gadot has made a total of $318.3m in domestic ticket sales in four weeks, according to industry tracker Exhibitor Relations.
Gadot, of the Fast and Furious series, plays an Amazonian goddess-princess-superhero whose lasso, bracelet and tiara have magical powers.
47 Meters Down, the adventures of two sisters who fend off a shark attack after going cage diving, scored $7.4m.
Coming in fifth was The Mummy, starring Tom Cruise, which made $5.8m.
The film - the latest revival of the original Mummy made in 1932 - cost $125m to make and has been widely panned by critics.
