|Prototype of Megatron's appearance in the 2007 film.|
| Media information|
|Voiced by:|| Frank Welker|
|First appearance:||The Transformers|
|Last appearance:||Transformers: Age of Extinction (as Galvatron)|
Megatron is often the primary antagonist in the Transformers franchise and many of its recent incarnations. Megatron is often the leader of the evil faction of his race, the Decepticons. In Generation 1 (The Transformers cartoon), Megatron's alternative mode is a pistol that can shrink to be held and used as a weapon by another Transformer. Megatron is often seen by his second-in-command Starscream, who is always plotting to overthrow Megatron. In a later season of the series, it is revealed that Megatron was the first of the Decepticons to have an alternative mode, as he was created as a stealth weapon to use against the Autobots.
In the more recent film adaption of the Transformers series, Megatron was placed in command of Cybertron's military force by the Autobot leader Sentinel Prime. When Sentinel chose Optimus Prime as his successor over Megatron, The Fallen used Megatron's jealously to convince him to turn against the Autobots. This thus was one of the many factors that began the war between the Autobots and the Decepticons on Cybertron.
- A promotional image of Megatron for the 2007 Transformers film features Megatron with blue opticals, as opposed to the red opticals seen on him in the film and the other Decepticons.