It was supposed to be like it always was. They show up on the planet and endear themselves to the locals and let the smarter and more cunning ones try to fight them. Once the Bliss was used they were defeated and the planet used for all it was worth. The people as well.
The "Solar System" and "Earth" as it was called they believed would be the same.
Then they got to see metal world the size of the Earth's Moon with what looked like a giant head serving as a moon and a horrific trophy close to the system's star. Massive solar activity was being caused by something from the silvery planet.
All on the ships were transfixed at the sight as suddenly saw the energy of the solar flares being channeled into the planet, and a massive scorpion shaped starship was sent flying off at faster than light speeds. Then to their surprise the metal planet turned a glowing gold color.
At this point everyone in the fleet felt that they should leave this system and never return. There was no good reason to stick around after that.
Galvatron would never learn that his actions would actual save the Earth from being invaded by a species known as the Vs. He likely won't have found it very funny even if he had.