Thunder Mayhem is the combined form of the Decepticons Bludgeon, Grubage (aka Ruckus), Needlenose, Spinister, and Windsweeper. He is similar to the character of Thunderwing, whose Spark is also a part of his being through presence of the Matrix of Malice.
In Transformers: Of Masters and Mayhem, Thunder Mayhem is responsible for destroying Cybertron, killing many Autobots and Decepticons alike and driving the handful of survivors from the planet. Impactor, last member of the Wreckers, soon set out to form a new team to challenge him, eventually recruiting enough members to form Wreckage.
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