Earth: birthplace of the human race. A species much like our own; capable of great compassion and great violence. For in our quest to protect the humans, a deeper revelation dawns: Our worlds have met before...

This is Optimus Prime's opening narration from 'Transformers: Revenge of the Fallen' (2009), revealing the ancient history between Cybertronians and humans. The line 'Our worlds have met before' sets up the film's plot about ancient Transformers on Earth. The first 'Transformers' (2007) has a different opening focused on the All Spark. 'I, Robot' and 'Star Wars' are unrelated to this storyline.