Let me guess. You're gonna attempt to overthrow Megatron, fail, cry, then repeat the cycle.
Starscream is the treacherous Decepticon Air Commander and the deadliest of the Seekers. The self-proclaimed pride of the Cybertron War Academy, he's famous not only for his incredible skill, but also for his limitless (and troublesome) ambition. Starscream believes that he is more suited for command than Decepticon leader Megatron. Thankfully for Megatron, Starscream's mutinous, power-grabbing plots are almost always transparent, and he can never muster up enough patience to complete a grandiose power play. Even on the few times he has taken control of the Decepticons, he quickly loses control of a situation, but is too arrogant to realize when he's in over his head. He never learns from his mistakes, but then again, Megatron doesn't either, seeing as how he's never turned Starscream into slag. Despite his constant failures, Starscream believes it is only a matter of time before he prevails—his destiny is inevitable.
Starscream's never give up attitude extends even to the afterlife: unlike most Transformers, he has a mutant, indestructible Spark. His life-force cannot be destroyed and can persist even without a body to contain it. However, there is no indication that Starscream (or anybody else) was aware of this fact prior to his destruction.
—Megatron on Starscream, "Total War!"
A former scientist who joined the Decepticons with gusto after the loss of his friend Skyfire, Starscream quickly decided that Megatron's leadership was old and outdated, and that he was the one who should be in charge. Cue nine million years of backstabbing, treachery, cowardice, coups and general disobedience, which continued when the war moved from Cybertron to Earth. In fact, it was Starscream's refusal to listen to Megatron that kept the war going, when a petty parting blast that he delivered to the Autobot's crashed starship jostled the body of Optimus Prime into the path ofTeletraan I's restoration beam. Starscream's scheming was a constant throughout the Earth conflict, and it culminated in his expulsion from the Decepticon ranks, following which he created the Combaticons to serve as his personal army, only to have them turn on him, forcing him to rejoin Megatron's ranks.
Even in death, Starscream was unstoppable. Following Megatron's climactic battle with Optimus Prime in 2005, Starscream set his commander's battered body adrift in space and promptly appointed himself the new Decepticon leader. In the midst of a grandiose coronation ceremony, however, Megatron returned, recreated as Galvatron by the power of Unicron, and promptly blasted Starscream to ashes. Surprisingly, Starscream's lifeforce persisted as a ghost, which continued to bedevil the Transformers, even across the gulf of time.