New York ? It took six weeks but Black Panther has finally been unseated as the top film at the North American box office. The monsters vs. robots science-fiction sequel Pacific Rim: Uprising dethroned the superhero sensation with $28m in ticket sales over the weekend, according to studio estimates on Sunday. But the result for Pacific Rim: Uprising, a Universal Pictures-Legendary Entertainment release that cost $150m to make, was soft ? at least domestically.