The Transformers: Hearts of Steel staunch ally of Muldoon after the Decepticons betray him. Only four Autobots were mentioned by name in the series: Bumblebee, Ironhide (in the TPB when he gives his name it was changed to Sideswipe) and Optimus Prime although he did not appear, though others are recognizable as G1 Generation 1 characters, introduced as toys in 1984. The opposite is true for the Decepticons, with many being named. Others are left unnamed but are recognizable such as Ravage. In addition to their original alternate modes as fantasy beasts, the Transformers later adopt alternate modes appropriate to the era in which they
Transformers: Revenge of the Fallen book entitled "Transformers: The Movie Universe", which intended to provide factual data on the characters of the film. On June 10, 2009, the comic book adaptation of the film, written by Simon Furman was released. Additionally, Alan Dean Foster also wrote the novelization for the film. Meanwhile, Dan Jolley wrote "Transformers: Revenge of the Fallen: The Junior Novel", a 144-page book oriented at a younger audience than the one by Foster. Lastly, a book titled "Transformers: The Art of the Movies" was released, documenting behind-the scenes aspects of the making of the film. Other minor tie-in publications include "Transformers: Revenge