Starscream is a fictional character in the many continuities in the Transformers franchise. He is one of the most frequently occurring characters in the Transformers fictional work, appearing in almost all continuities of the Transformers franchise. Generally depicted as a deadly Decepticon who transforms into a jet fighter and who serves as Megatron's second-in-command on Earth, Starscream's defining trait is his desire to overthrow Megatron and take his place as Decepticon leader.