Thundercracker is a Decepticon Seeker with the ability to create deafining sonic booms. He is contemptions of anything that can not fly, and is not totaly convinced about heDecepticons' cause. He transforms into a Jet. In one continuity he was killed and turned into Scourge by Unicron. In other contunities they exist simutaneously.
Featured in these Comics
History
In The Transformers Movie #1 Thundercracker is killed and turned into Scourge by Unicron. In other comic contunities the two are seen at the same time.