“Iron Man” stayed golden in its third frame at the foreign box office with $25.6 million at more than 5,000 playdates, while “The Chronicles of Narnia: Prince Caspian” debuted powerfully with $20.7 million at 2,000 in a dozen markets.

As “Indiana Jones and the Kingdom of the Crystal Skull” waits in the wings, international multiplexes also saw solid overall biz from “What Happens in Vegas,” which continued to grab counterprogramming coin with $20 million at 4,200, declining only 20% in its soph sesh. But “Speed Racer” remained an underperfomer, falling 44% from its subpar launch to $7 million at 4,700.

With three films topping $20 million, the overseas market appears primed to see “Crystal Skull” deliver monstrous offshore grosses this weekend — possibly even challenging the $251 million launch record set a year ago by “Pirates of the Caribbean: At World’s End.”

The success of “Iron Man” — handled by Par in most overseas territories — has already underlined the appetite for mega-franchise action fare in foreign markets. It’s become the year’s top Hollywood title with $206 million internationally and $428 million worldwide.

“Iron Man” posted impressive holdover biz with a decline of only 34% from its second frame. In the U.K., cooler temps helped as grosses slipped just 5% to $3.7 million, lifting the Brit cume past $25 million. Australian biz also held well, off 30% to $2.2 million, while South Korea declined 56% to $2 million for a $21.9 million cume.

During a panel at the New York Comic Convention today, Marvel Comics announced that they will be working with Hugo and Nebula Award-winning science fiction writer Orson Scott Card to adapt two of his most acclaimed novels, Ender’s Game and Ender’s Shadow, into comic books later this year.

Ender’s Game, a cult-favorite novel about a child prodigy named Ender recruited to help fight an alien army, and Ender’s Shadow, a concurrent book focused on another young soldier, will launch as separate comics in late 2008, with the first Ender’s Game collection due out in summer 2009.

Like Marvel’s other literary crossovers, the Ender’s Game comics aim not only to woo new readers into comic stores, but also to continue the push of graphic novels and trade paperback collections into traditional bookstores and libraries where they can reach a more mainstream audience.

Card, who also currently scripts the Ultimate Iron Man superhero comic with Marvel, says he was eager to pursue a comic book adaptation, but that the rights were previously bound up in film deal for the two novels, which were optioned by Warner Brothers, the parent company of DC Comics.

“The moment I got the comic book and game rights extracted from the movie option deal, I let Marvel and other [publishers] know about the availability,” says Card. “I truly was open-minded about who would end up doing the books, [but] Marvel got there first, with a terrific, ambitious plan for Ender’s Game and Ender’s Shadow.”