Megatron comes to earth.
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Megatron comes to earth.
To destroy earth
In search of the "All Spark"
To hide himself
To kill Optimus Prime
In the Transformers storyline, Megatron travels to Earth in search of the All Spark, the powerful artifact that gives life to Transformers. This is the central plot motivation for the Decepticon invasion. Destroying Earth, hiding, or killing Optimus are secondary goals, not the primary reason.