Los Angeles ? Ben Stiller’s “Night at the Museum” sequel and Christian Bale’s “Terminator Salvation” are combining for a solid Memorial Day weekend at the box office.

According to estimates from distributor 20th Century Fox, “Night at the Museum: Battle of the Smithsonian” took in $53.5 million from Friday to Sunday. That put it well ahead of the first movie, which had a $30.4 million three-day opening in December 2006.

Distributor Warner Bros. said “Terminator Salvation” pulled in $43 million over the same period, plus $13.4 million on opening day Thursday. Its total since debuting was $56.4 million.

The fourth movie in “The Terminator” series came in a bit behind 2003’s “Terminator 3: Rise of the Machines,” the last of the franchise’s installments to star Arnold Schwarzenegger. That third chapter took in $44 million in its first weekend.

Paramount’s “Star Trek” held up well with $22 million, coming in at No. 3 and raising its total to $183.5 million. The movie is on the verge of becoming the year’s top-grossing movie so far, approaching the $193.1 million gross of DreamWorks Animation’s “Monsters vs. Aliens.”

The previous weekend’s No. 1 movie, Sony’s “Angels & Demons,” fell to fourth-place with $21.4 million, lifting its domestic haul to $81.5 million. “Star Trek” and “Angels & Demons” were close enough on revenues that their ranks could change once final numbers are reported.