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SG stands for Shattered Glass, for those who don't know what Shattered Glass is let me do the explaining.
Shattered Glass is the mirrorverse of the G1 series, where good are evil and evil are good, more or less Autobots are evil and the Decepticons are the good guys.
And Optimus....... In the G1 series he's a really really nice guy, mirrorverse version lets just say it makes G1 Megatron look a hero compared to the insane, the violent, the cheating and the cunning dictator of the Autobots.
This goes for most of the evil Autobots, the Decepticons on the other hand I'll get round to that in SG Megatron entry.