Mudflap is an Autobot in the Transformers: Dark of the Moon Movie Adaptation and Novel.
Mudflap appears in the film's comic-book adaptation - though not in the film. He also has a very minor part.
Mudflap first appears in a caption alongside Skids in the background, standing in front of Wheeljack. Later, he apparently stays at the base with Ironhide and Ratchet while the other Autobots escort Sentinel back to the base and battle The Dreads.
When the Autobots and Sentinel return - Ironhide kills the last surviving Dread, before Sentinel shoots him - and he immediatly begins to rust before being shot a second time ... which destroys his entire body. Sentinel says that all of the Autobots will have to die alongside Ironhide - to which Skids dimwittingly intervenes, and is shot as well, and also begins to rust up. Mudflap is furious over the death of his brother - and attempts to get his revenge by fighting Sentinel ... though is shot as well, and also rusts up and dies alongside Skids and Ironhide.