The fight scenes were extended, and a subplot about energy resources was added to make the film more topical. Although he intended to stay faithful to the look of the characters in the comic, Snyder intended Nite Owl to look scarier, and made Ozymandias' armor into a parody of the rubber muscle suits from 1997's "Batman & Robin". Production took place in Vancouver, where a New York City back lot was built. Sound stages were used for apartments and offices, while sequences on Mars and in Antarctica were shot against green screens. Filming started on September 17, 2007, and ended on February 19, 2008, on an estimated $120 million budget. To handle the 1,100 shots featuring visual effects, a quarter of them being computer-generated imagery, ten different effects companies were involved with "Watchmen". While 20th Century Fox filed a lawsuit to block the film's release, the studios eventually settled, and Fox received an upfront payment and a percentage of the worldwide gross from the film and all sequels and spin-offs in return.