Superheroes continue to defeat their foes at the box office.Disney's "Thor: The Dark World," earning $86.1 million, dominated the weekend box office as it opened domestically at No. 1, according to studio estimates Sunday.Starring Chris Hemsworth, the Marvel superhero sequel earned $109.4 million when it opened internationally last weekend and brought in $180.1 million globally. Overall, it has grossed $327 million worldwide.In limited theaters Thursday evening, "Thor: The Dark World" brought in $7.1 million overnight.Surpassing the ticket sales of "Thor," which scored $65.7 million when it opened in May of 2011, "Thor: The Dark World" marks a record for a Disney November opening, topping the $70.5 million "The Incredibles" earned in 2004.Paramount hidden-camera comedy "Jackass Presents: Bad Grandpa" held the second-place slot at the box office for the second weekend in a row, earning $11.3 million during its third weekend, with a domestic total reaching more than $78 million.Relativity Media's 3-D animated kiddie flick "Free Birds," soared into third place with $11.1 million in its second weekend.CBS Films' "Last Vegas," featuring an all-star cast including Michael Douglas, Robert De Niro, Morgan Freeman and Kevin Kline, took fourth place in its second weekend.Last weekend's box office champ, the sci-fi "Ender's Game," starring Harrison Ford, Asa Butterfield and Viola Davis, dropped to fifth place in its second weekend.Expanding to 1,144 theaters in its fourth week, possible Oscar contender "12 Years a Slave" brought in an impressive $6.6 million over the weekend at No. 7.___Estimated ticket sales for Friday through Sunday at U.S. and Canadian theaters, according to Rentrak. Final domestic figures will be released Monday.1. "Thor: The Dark World," $86.1 million.2. "Jackass Presents: Bad Grandpa," $11.3 million.3. "Free Birds," $11.1 million.4. "Last Vegas," $11.1 million.5. "Ender's Game," $10.2 million.6. "Gravity," $8.4 million.7. "12 Years a Slave," $6.6 million.8. "Captain Phillips," $5.8 million.9. "About Time," $5.1 million.10. "Cloudy with a Chance of Meatballs 2," $2.8 million.