[quote=CallaLily180]
Yes but he would regenerate and come back, he is immortal and you can't kill him. Maybe banish him of course but not forever. And Optimus could totally fight him, he could even but Trigon wouldn't die. At least I think...
[/quote]
Unicron's head was orbiting around Cybertron for like 10 years and still survived. I never said kill (or did I?)