On May 30, 2007, Dreamworks greenlit two sequels to Transformers,[98] and Shia LaBeouf,[99] Megan Fox[100] and Peter Cullen[38] signed on to return. Producer Tom DeSanto has envisioned a storyline introducing the Dinobots, the Constructicons, and Soundwave.[16] Writers Roberto Orci and Alex Kurtzman may not return, as "Star Trek... is taking up kind of all of our time."[27] Michael Bay has not signed on, "trying to keep some leverage for the negotiations",[38] but already has ideas, including an aircraft carrier character. [101]