Lucky for you there's no slap emoticon ...
Cybertron is the home planet of ALL Transformers .
If you meant when Megatron -> Galvatron ?
It was in the Transformers Movie which after being severely injured by Optimus Prime on a base raid , Megatron was dumped by Starscream as space floatsm until Unicron needed a new army .
And viola , came Galvatron to lead that army . Only to be given another beating again .
I must feel proud about the things I choose ...,
Be it Ero-games , doujinshi , or clothes ; its all the SAME !