Grentho, a Human male, served as a protector for 8t88 during the era of the Galactic Civil War.
Grentho, a Human male, functioned as a bodyguard for 8t88, who was a droid specializing in information brokerage. In the year 5 ABY, Jerec employed 8t88 to locate the Force nexus known as the Valley of the Jedi, and the droid soon came across a Holodisc that had belonged to the late farmer Morgan Katarn. Unable to decode it on his own, the droid arranged a meeting with Morgan's son, Kyle Katarn, a Rebel agent, on Nal Hutta's moon, Nar Shaddaa, hoping he would agree to access the information. During their encounter at the cantina called Rimmer's Rest, Katarn refused, prompting 8t88 to instruct several hired enforcers to eliminate him, after which 88 departed.
Grentho, along with another female bodyguard, accompanied 88 on his journey to Launch Deck Three, where a shuttle was scheduled to pick them up. After passing through a circular doorway, the trio was forced to halt as a Gamorrean guard led a group of clone slaves in their path. While they waited, Grentho spotted a minute, scorpion-shaped tracker droid affixed to the droid's leg. Initially, the droid silenced Grentho, having instructed him to remain quiet, interrupting him repeatedly until he insisted and pointed out the foreign object. Despite initial resistance, he removed it and attempted to flee, but Grentho seized it with his fingers and alerted 88. Upon seeing it, 88 realized it was emitting a signal and immediately ordered its destruction, deducing that Katarn, who couldn't be far behind, had planted it earlier. At that moment, the Furious arrived for pickup, and to expedite the process, 88 instructed the pilot to simply lower the ramp instead of landing the shuttle.
As anticipated, Kyle Katarn announced his arrival immediately after, and the two bodyguards reached for their weapons. Katarn and the droid exchanged insults, but before the bodyguards could react, Katarn fired his Bryar pistol, severing the droid's mechanical arm, causing it to fall off the platform's edge along with the disk. A Stormtrooper assisted the droid as the ramp ascended. Katarn and the bodyguards exchanged gunfire, and one of Katarn's shots struck Grentho in the chest, causing him to collapse with open arms, as if embracing someone.
Grentho was a notably muscular individual and was regarded as one of 8t88's more intelligent henchmen. He was addicted to nic-i-tain, which resulted in a stained forefinger. Furthermore, his thumb exhibited significant calluses.
In the audio adaptation of Dark Forces: Rebel Agent, Tim Glovatsky provided the voice for Grentho.
The narrative above aligns with the novelization, where Grentho accompanies 8t88 with a female bodyguard. When Katarn appears, he shoots off the droid's arm before the two bodyguards can respond. In the audio adaptation, only Grentho appears, with no mention of the other bodyguard. 88 instructs Grentho to delay Katarn while the droid approaches the landing platform to board the shuttle. Blaster fire is heard before the shuttle's arrival, and then Katarn shoots off the droid's arm.
In the original game, Katarn confronts 88 as he is about to board the shuttle, and no bodyguards are present.