The past 3 years have been rough for our Robots in Disguise. The battles of Mission City. Cairo. Chicago. And this year's promisin' to be rougher than all these combined. And I got a feeling Lockdown's gonna go Kurt Hectic on our Autobot heroes. I just know it.
Actually, it was 2 years between Mission City and Cairo, two-three years between Cairo and Chicago, and by the events of Transformers: Age of Extinction, the Battle of Chicago is five years old.