Tranformers Two Direction

Producer Don Murphy was planning a G.I. Joe film adaptation, but when the United States took part in the invasion of Iraq in March 2003, Hasbro suggested adapting the Transformers franchise instead. Tom DeSanto joined Murphy because he was a fan of the series. They met with comic book writer Simon Furman, and cited the Generation 1 cartoon and comics as their main influence. They made the Creation Matrix their plot device, though Murphy had it renamed because of the The Matrix film series. DeSanto chose to write the treatment from a human point-of-view to engage the audience, while Murphy wanted it to have a realistic tone, reminiscent of a disaster film. The treatment featured the Autobots Optimus Prime, Ironhide, Jazz, Prowl, Ratchet, Wheeljack, and Bumblebee, and the Decepticons Megatron, Starscream, Soundwave, Ravage, Laserbeak, Rumble, Skywarp and Shockwave.

Steven Spielberg, a fan of the comics and toys, signed on as executive producer in 2004. John Rogers wrote the first draft, which pitted four Autobots against four Decepticons, and featured the Ark spaceship. Roberto Orci and Alex Kurtzman, fans of the cartoon, were hired to rewrite the script in February 2005. Spielberg suggested that "a boy and his car" should be the focus. This appealed to Orci and Kurtzman because it conveyed themes of adulthood and responsibility, "the things that a car represents in [the United States]". The characters of Sam and Mikaela were the sole point-of-view given in Orci and Kurtzman's first draft. The Transformers had no dialogue, as the producers feared talking robots would look ridiculous. The writers felt that even if it would look silly, not having the robots speak would betray the fanbase. Spielberg read each of Orci and Kurtzman's drafts and gave notes for improvement. The writers remained involved throughout production, rewriting dialogue for the robots during the sound mixing, after finding unexpected quirks in the characters' animation.

Michael Bay was asked to direct by Spielberg on July 30, 2005, but he dismissed the film as a "stupid toy movie".Nonetheless, he wanted to work with Spielberg, and gained a new respect for the mythology upon visiting Hasbro. Bay considered the first draft "too kiddie", so he increased the military's role in the story. The writers sought inspiration from G.I. Joe for the soldier characters, being careful not to mix the brands. They also experimented with numerous robots from the franchise, ultimately selecting the characters most popular among the filmmakers to form the final cast. Bay acknowledged that most of the Decepticons were selected before their names or roles were developed, as Hasbro had to start designing the toys. Some of their names were changed because Bay was upset that they had been leaked. Optimus, Megatron, Bumblebee and Starscream were the only characters present in each version of the script. Arcee was a female Transformer introduced by Orci and Kurtzman, but she was cut because they found it difficult to explain robotic gender; Bay also disliked her motorcycle form, which he found too small. An early idea to have the Decepticons simultaneously strike multiple places around the world was also dropped.