A male Evocii, Grub served the Hutt Cartel as an ambassador during the Galactic War between Galactic Republic and Sith Empire. Around 3639 BBY, Grub was aboard the Sith Empire's capital ship Ziost Shadow, meeting Ambassador Rove of the Imperial Diplomatic Service, as an Imperial strike team arrived.
Despite his Evocii people being greatly mistreated by the Hutts, Grub worked as their representative.
Ambassador Grub appears in the 2011 video game Star Wars: The Old Republic, in Update 1.1 "Rise of the Rakghouls". He is featured in the Empire-sided operation "Karagga's Palace," as part of the quest "Best Foot Forward."