At some point during the Industrial Revolution, noise outside their cave awakens the Autobot Bumblebee. He ventures outside the cave to discover the planet's new dominant species — man, and that they have developed steam powered technology and the capacity to build railroads.
At a time during the Industrial Revolution, a sound from outside a cave awakened the Autobot Bumblebee. He went outside to discover the planet's dominant species — humans — who had developed steam-powered technology and the capacity to build railroads.