Who is Sinestro in Lanterns episode 2?

A new episode of Lanterns has arrived, and with it comes a mysterious new character with some pretty sinister comic book origins. Besides, what's a good mystery-thriller without a few shady characters to complement our main heroes?The new DC show may focus on Hal Jordan (Kyle Chandler) and John Stewart (Aaron Pierre), but it doesn't shy away from mentioning and including other Green Lanterns of the past and present (and this is definitely due in part to the direct involvement of comic book write