He is not Sith rather he is the Dark Side.
—Agen Kolar talks about Grentarik.
Grentarik was a male Killik Dark Sider who trained members of his hive in the ways of the Dark Side. During the Battle of Alderaan, Grentarik was killed by Agen Kolar.
Behind the scenes[]
Grentarik will be voiced by Jamie Glover in the Star Wars: The Clone Wars.