Summit’s “Ender’s Game” is topping this weekend domestically with a projected $27 million bow, an OK start for the teen lit adaptation that was not quite as hotly anticipated as Lionsgate had hoped.

“Game” opened to $9.9 million Friday, including $1.4 million from late night showings on Halloween. The bow is fine for Lionsgate, which in addition to distributing the film Stateside financed 20% of its $110 million budget, all its portion of which will be recouped this frame. It’s just not the bow Lionsgate may have hoped for given the book’s following.

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The film has only a few weeks to prove itself before another YA adaptation from Lionsgate, “The Hunger Games: Catching Fire,” opens and blows it out of the water.

Paramount’s “Jackass Presents: Bad Grandpa” is expected to take second in its soph sesh with around $17 million, and a pair of openers should fall in right behind.

CBS Films’ “Last Vegas” earned $5.1 million on Friday and should see about $15 million by Monday. Though launching in third, “Vegas” is likely to have longer legs than the competition and better midweek attendance as older moviegoers, the comedy’s primary target, are more likely to forego the opening weekend rush.

Still a couple months shy of the end of the year, Disney Int’l broke its 2010 overseas record of $2.302 billion. With its early overseas bow of “Thor: The Dark World,” the Mouse is hitting a new high of $2.314 billion, according to estimations from the studio.

This reps the fourth consecutive year Disney has topped $2 billion internationally. The “Thor” sequel has earned $45.2 million since its Wednesday bow in numerous overseas markets.

Also opening this frame domestically, Relativity’s “Free Birds” was expected to take second. Now, with estimates scaled back just a couple million from pre-weekend predictions of $16 million, the toon should land in fourth. Given its holiday-specific subject matter, “Birds” hopes to draw auds looking for family fare closer to Thanksgiving.

Finally, Universal bowed “About Time” in a modest 175 locations to build word of mouth prior to its launch wide next weekend. It’s expected to earn just over $1 million in three days.