began courting other writers in May 2007, but were unimpressed with other pitches and eventually convinced Orci and Kurtzman to return. The studio also hired Ehren Kruger, who had impressed Bay and Hasbro president Brian Goldner with his knowledge of the Transformers mythology. The writing trio were paid $8 million. Screenwriting was interrupted by the 2007–08 Writers Guild of America strike, but to avoid production delays, the writers spent two weeks writing a treatment, which they handed in the night before the strike began. Bay then expanded the outline into a 60-page scriptment, which included more action, humor, and characters. The three writers spent four months finishing the screenplay while "locked" in two hotel rooms by Bay; Kruger wrote in his own room and the trio would check on each other's work twice a day. Orci described the film's theme as "being away from home", with the Autobots contemplating living on Earth as they cannot restore Cybertron, while Sam goes to college. He wanted the focus between the robots and humans "much more evenly balanced", "the stakes [to] be higher", and more focused on the science fiction elements. Orci added he wanted to "modulate" the humor more, and felt he managed the more "outrageous" jokes by balancing them with a more serious plot approach to the Transformers mythology. Bay concurred that he wanted to please fans by making the tone darker, and that "mums will think it[']s safe enough to bring the kids back out to the movies." Two elements were added late into the film: the Autobot Jolt—as General Motors wanted to advertise the Chevrolet Volt—and the railgun that kills Devastator, a new acquisition by the United States military. In September 2007, Paramount announced a release date for the sequel to Transformers in late June 2009. The film was given a $200 million budget, which was $50 million more than the first film, although Variety put the budget spend at over $210 million, after rebates. Some of the action scenes rejected from the first film were written into the sequel. Producer Lorenzo di Bonaventura later stated the studio proposed filming two sequels simultaneously, but he and Bay agreed that the idea was not the right direction for the series. Prior to the first film's release, producer Tom DeSanto had "a very cool idea" to introduce the Dinobots, while Bay was interested in including a Transformer who transforms into an