Big-screen Iron Man Robert Downey Jr. scored his second No. 1 movie of the summer on Sunday as Hollywood spoof “Tropic Thunder” ended the month-long reign of “The Dark Knight” atop the North American box office.

“Tropic Thunder,” a farcical combat movie within a comedy that also stars Ben Stiller and Jack Black, grossed $26 million during its first weekend in U.S. and Canadian theaters, bringing its five-day estimated total from Wednesday’s opening to $37 million.

Downey who appears in the film in blackface, portraying a white actor playing a black action hero, also starred in the summer’s first chart-topping movie, Marvel Studios’ “Iron Man.”

The superhero drama, which like “Tropic Thunder” was distributed by Viacom Inc’s Paramount Pictures, grossed nearly $99 million its opening weekend in May.

In “Tropic Thunder,” Downey, Stiller and Black star as self-absorbed Hollywood actors caught up in a real-life battle with narco-terrorists while filming a war movie in Southeast Asia. The film was directed, co-written and co-produced by Stiller.

The blockbuster Batman sequel “The Dark Knight” slipped to No. 2 with $16.8 million in ticket sales in its fifth weekend of release but broke yet another commercial barrier along the way by becoming the second-highest-grossing film ever, according to box office tracking service Media By Numbers.