Thor sequel tops box office for second week in a row

Thor: The Dark World has scored a hammer blow on the North American box office for the second week in a row.

The superhero film took in $38.4 million over the weekend (15-17Nov13) to beat out new release The Best Man Holiday, which earned $30.6 million over the same period.

The Thor sequel also grossed $52.5 million overseas, bringing its global haul to $479.8 million.

Last Vegas, which features Morgan Freeman, Kevin Kline, Robert De Niro and Michael Douglas as aged pals enjoying a wild weekend in Sin City, comes in third with $8.85 million and animated film Free Birds takes fourth place with $8.3 million.

Johnny Knoxville's comedy Bad Grandpa rounds out the top five.

Meanwhile, George Clooney and Sandra Bullock are celebrating after learning their science fiction thriller Gravity has hit the $500 million mark at the worldwide box office.