Chameleon dropped down from the branch of a tall tree in the jungles of Australia. His rival, Bizarro, was strolling around the jungles and was oblivious to the Raptor warrior. Chameleon picked up a nearby by snake and threw it at the back of Bizarro's head. When that didn't get his attention, he threw a ball of acid at Bizarro, which did manage to catch Bizarro's attention.
"Goodbye, enemy." said Bizarro as he turned around.
Unicron, the nearly planet-sized Decepticon, was elsewhere in the solar system, and was making on his way to Earth.