Frank Welker voices Soundwave, Megatron's Communication Officer. In the 2009 movie he doesn't adopt any robot or vehicle modes and is only seen in what the toyline calls "satellite mode", which he uses to attach himself to a military satellite to coordinate the Decepticons' movements around the world. His toy version, however, apart from this mode, has a proper robot mode and transforms into a Cybertronian craft. The concept artists also designed an Earth form of a Chevrolet Silverado for him to upgrade into, which was ultimately dropped.
The filmmakers had tried to work Soundwave into the 2007 film twice, and these roles eventually evolved into Blackout and Frenzy. The latter character was particularly thought to be too different from the original.
In Transformers: Dark of the Moon, Soundwave transforms into a silver Mercedes-Benz SLS AMG who poses as a car given to Carly by Dylan, ultimately getting killed by Bumblebee.
Read more about this topic: List Of Characters In Transformers (film Series), Decepticons