威震天 (Megatron) is a fictional character from the Transformers franchise. He is the leader of the Decepticons, a group of robotic villains who often oppose the heroic Autobots. Megatron is known for his powerful and ruthless nature, often seeking to conquer and dominate other worlds. In his various incarnations, Megatron transforms into different vehicles or weapons, showcasing his versatility in battle. He is characterized by his metallic gray appearance and intimidating presence. Throughout the Transformers series, he is portrayed as a formidable adversary to Optimus Prime, the leader of the Autobots.