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Hammer is a name applied to Decepticon characters with a penchant for appearing as part of duos that play on his name.
The first Hammer was a Micromaster and member of the Constructor Squad who could combine with his teammate Sledge.
In the Aligned Continuity Hammer is a Mini-Con who transforms between a spherical form and a robot form that resembles either a Dragon or a Phoenix.
Hammer appears in Robots in Disguise where he and Anvil are partnered with Bisk in order to steal Sound boards from a rock concert for use in repairing the Alchemor. The pair nearly caught Russell Clay after he stumbled upon their attempted theft, and were then defeated by Bumblebee and captured along with Bisk.