I've been trying to figure out in my head the time line of events based off of what Megatron was telling Starscream in DOTM and just can't seem to work it out (and I'm aware of of plot holes and things not adding up). So from what Megs said I kind of got this: He was already planning a visit to Earth to rendezvous with Sentinel which means he (and assuming the Decepticons) already knew of Earth and its "resources" before any of the events that took place in the first film. Yet in the first film he coincidentally ended on Earth because thats where the All Spark happened to have crashed. Or Sentinel and Megatron made a pact before the cube was even lost in space. Then the Cube was lost and Megatron set off after it. This could be likely cause Optimus was still on Cybertron when the Ark escaped (the prologue sequence in DOTM) and only left when he went in search of the Cube himself (is that right?). But then you have the events in ROTF! Why then, when Megatron was revived was he allowing The Fallen to go ahead and destroy Earth when Megs and Sentinel needed the humans to rebuild Cybertron? And it's not like he forgot about his plan (remember in DOTM Sam said "they've been planning this for 50 years"). So all the setup Soundwave and Laserbeak were doing was going to waste cause The Fallen just wanted to have is way and kill the humans out of spite! I could go on but what but what do you guys think?