On May 1, 2013, actor Kelsey Grammer was cast as the lead human villain named Harold Attinger. On May 6, 2013, actress Sophia Myles was cast in a major role. That same month, Chinese actress Bingbing Li and comedian T. J. Miller joined the cast. On July 14, 2013, Bay announced that Han Geng had joined the cast. That same month, Titus Welliver also joined the cast. In 2012, Hugo Weaving (voice of Megatron) indicated that he would not be returning for a fourth film, describing the role as "meaningless". In Weaving's place, longtime "Transformers" voice actor Frank Welker was cast as Galvatron (traditionally a reincarnation of Megatron), reprising his role from the third and fourth seasons of the original animated series. Bay announced that filming had begun on May 28, 2013, in Monument Valley, Utah. Detroit, Michigan, was used as a stand-in for Hong Kong while McCormick Place in Chicago, Illinois, was re-dressed to portray a city in China. The movie was the first feature film to be shot using smaller digital IMAX 3D cameras. It also was shot in various other formats, including IMAX 70mm film cameras, digital stereo 3-D, and anamorphic and spherical 35mm film. From May 28 to June 24, 2013, Michael Bay uploaded photographs of several cars featured in the film, all apparently Autobots, to social networks including Facebook and Flickr. The film featured two unknown Autobots that transformed into a black and blue 2013 Bugatti Veyron Grand Sport Vitesse (going by production name "Drift"), and a green 2014 C7 Corvette Stingray concept (going by production name "Slingshot"). Also revealed was a truck from Western Star Trucks as Optimus Prime's new alternate mode. The Dinobots and Lockdown were confirmed to appear. On October 29, Michael Bay's Official Twitter Account tweeted that principal photography of "Transformers 4" had been completed in Hong Kong, and the cast and crew were heading to the Chinese mainland. (According to previous reports, they would be filming there for one week.) Additional filming in Detroit began in early 2014; a pair of steamships ("Columbia" and "Ste. Clair") which had once traveled between Detroit and Bois Blanc Island's amusement park were partially restored and used as props for the film. On October 17, 2013, while filming in Hong Kong, Bay was assaulted by two brothers surnamed Mak, who demanded a payment of HK$100,000 (US$12,900).