questionshow does megatron stay alive?

vote-for2vote-against
vote-for1vote-against

You obliviously missed something in the series.
He was killed in 1, then revived in 2 and ran away before Optimus finished him. That's why half is face is still missing in 3.

I won't say any more.

vote-for5vote-against

because he accepted christ as his lord and savior.

vote-for5vote-against

Because it's in the scripts, silly!