With everything we are Seeing in TFs DotM and scenes of the 60's some are questioning when exactly did the Autobots first come to Earth Searching for the AllSpark. Was it in 2007 when the first movie took place? No. Was it in the 60's and they have been hiding and waiting for the right time to come to Earth? Maybe. But one thing is for sure... they have been watching Earth and looking for the AllSpark for at least 4 years, probably longer before we and Sam first see them in 2007. Do you guys remember the first tv spot for the first Transformers? The Beagle 2 Mars probe landed on Mars in 2003 where it was crushed by Bumblebee. The launch of this mission was before 2003 as it took much time for the probe to make it to Mars so... the Autobots could have been on Mars or around Mars for some time before that.