A highly anticipated adaptation fails to make a big splash at the box office, while Asgard's mightiest Avenger made his international debut.

Opening in the number 1 spot is Ender's Game (read our review) with $28 million. While not a bad start, Summit Entertainment likely hoped for more out of this adaptation, especially with Thor: The Dark World on the horizon.

Reviews for the film have been mostly positive, or at least middle of the road, which suggests Ender's Game could do well in the long run and when it expands to global markets. But with a $110 million budget, it's going to be tough to justify an adaptation of Speaker of the Dead or one of the other novels in the series.

In at number 2 is Jackass Presents: Bad Grandpa with $20.5 million, which brings its domestic total up $62 million. Bad Grandpa held surprisingly well for an R-rated niche comedy, dropping only 36%. It is also on pace to surpass Jackass Number Two ($72 million) within the next week or so.

Last Vegas (read our review) is the number 3 film with $16.5 million. Although the film didn’t hit Hangover-type numbers – despite the obvious parallels – this is the second highest opening for a CBS Films release, behind The Woman in Black ($20.9 million). Moreover, the film will likely do well in the long run thanks to its admittedly older demographic.

Kevin Kline, Morgan Freeman, Robert de Niro and Michael Douglas in Last Vegas

The animated comedy Free Birds (read our review) opened at number 4 with $16.2 million. Although Free Birds' budget is on the low side for an animated feature, Relativity was likely hoping for something better than a $16 million opening. Cloudy 2 is seemingly out of the picture as far as animated releases go, leaving Free Birds as the lone option. Yet, the film couldn't do better than a 4th place finish.

Gravity rounds out the top 5 with $13.1 million. While the November releases will slowly push Gravity out of the top 10, there's no denying Alfonso Cuaron's film was the king in October. The film has accumulated $219 million over four weeks and is now the 8th highest grossing movie of the year. Additionally, the film has been doing extremely well overseas, amassing $426 million worldwide, which is good enough for the number 10 spot this year.

Coming in at number 6 is Captain Phillips with $8.5 million. Now at $82 million domestic, this real-life drama starring Tom Hanks has done extremely well, and should finish somewhere near $100 million.

The number 7 film this weekend is 12 Years a Slave (read our review) with $4.6 million. Steve McQueen's latest film expanded to most major markets over the weekend (410 screens overall) and continues to post strong per-screen-averages. Expect this one to have some legs as Oscar talk continues to heat up.

In at number 8 is Cloudy with a Chance of Meatballs 2 with $4.2 million. Sony's animated sequel is now up to $106 million.

Brent, Flint, Sam, Earl, and Steve in 'Cloudy with a Chance of Meatballs 2'

Carrie comes in at number 9 with $3.4 million. While the horror remake did see an uptick on Halloween night, it sank right back down afterwards. The film has grossed $31 million thus far.

The Counselor falls to the number 10 spot this week with $3.2 million, which brings its domestic total up to $13 million. Despite strong star power from the likes of Brad Pitt and Michael Fassbender, a fairly confusing series of trailers likely provided little incentive for moviegoers. The Counselor might make back its $25 million budget, but won't clear it by much.

Outside the top 10: Richard Curtis' time-travelling film About Time opened with $1.1 million on 175 screens; the Matthey McConaughey drama Dallas Buyers Club collected $264,000 in limited release for a per-screen-average of $29,333; and Keanu Reeves' directorial debut, Man of Tai Chi (read our review), pulled in a measly $112,300 on 110 screens.

And finally, Thor: The Dark World opened in 36 international markets this weekend and pulled in $109 million. For comparison, that's a little over half what Iron Man 3 made in its international debut. We'll find out how the Marvel sequel will do in domestic theaters next weekend.

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[NOTE: These are only weekend box office estimates - based on Friday and Saturday ticket sales coupled with adjusted expectations for Sunday. Official weekend box office results will be released on Monday, November 4th - at which time we'll update this post with any changes.]

Source: Box Office Mojo