Darth Plagueis was born Tony Bubonic on the planet Muunilist.  He suffered from severe narcolepsy.  One day his apprentice, Darth Sidious, got fed up with Plagueis sleeping and missing all his cool new lightsaber moves, so he killed him. 
Palpatine plagueis

Darth Plagueis falls asleep (again). A young Sidious loses his mind and kills his master.

800px-Owen Luke

Owen Lars pointing to the moon, which sounds like "Muun", which is where Plaguis was from.

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