You have to take the allspark away from megatron with the made of character and hit him with the allspark
After you do that fight megatron with optimus prime with guns and hand to hand
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this is how you defeat megatron for good you jump back on megatron then is how so stop it
To defeat megatron all you have to do is first knock the allspark out of is hands by fighting him and then get the allspark and hit megatron with it and it will kill him but then you have to be optimus and fight megatron untill dead
MEGATRON!!!!!
the answer is no i have searched for years u can only complete the game and play as starscream or megatron hope this helps
Just keep hitting him until you defeat him.