The All Spark has landed on the Earth

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"Before time began, there was ... the Cube. We know not where it comes from, only that it holds the power to create worlds, and fill them ... with life. That is how our race was born. For a time we lived in harmony, but like all great power, some wanted it for good ... others for evil. And so began the war. A war that ravaged our planet until it was consumed by death. And the cube was lost to the far reaches of space. We scattered across the galaxy, hoping to find it and rebuild our home; Searching every star, every world. And just when all hope seemed lost, message of a new discovery drew us to an unknown planet called ... Earth. But we were already too late. " - Optimus quotes.
This is the speech Optimus prime gives in the opening narration of the first movie.