Suggested by DarkLK Megatron is certainly a powerful Decepticon, but I’m skeptical as to whether or not he can handle the Spectre. Spectre may be a cosmic being but he has some physical abilities as well. He was able to take a blow from Superman after all which is no small feat. He is also fast enough to dodge Megatron’s attacks with ease. His blows will eventually fell the mechanical menace in due time. Spectre wins.