Nahdar Vebb was a male Mon Calamari who served as a Jedi Knight during the Clone Wars between the Galactic Republic and Confederacy of Independent Systems. Vebb was the Padawan of Jedi Master Kit Fisto prior to the Clone Wars. With the outbreak of the war, Fisto became a Jedi General in the Grand Army of the Republic and was unable to see Vebb's apprenticeship through to the end. Sometime around the beginning of the war, Vebb completed his training in his master's absence and ascended to the rank of Jedi Knight. With the war still raging, Vebb joined the Republic's forces as a Jedi healer.
Around 22 BBY, Nute Gunray, a leading member of the Separatist Council, was captured by Republic forces on Rodia. Gunray escaped captivity in a stolen Republic vessel and fled to the Outer Rim world of Vassek. Vebb, accompanied by a group of clone troopers under Commander Fil, tracked the stolen vessel to the planet's moon in hopes of recapturing Gunray. Shortly after arriving, Vebb and the clones were met by the Mon Calamari's former master, Kit Fisto, who had also followed Gunray to Vassek. On the planet, the Jedi and clones discovered a large fortress in which they began to search for the Neimoidian. However, after confronting both Gunray and Confederate Head of State Count Dooku via hologram, it became evident to Vebb and Fisto that they had been lured into a trap. Unbeknownst to them however, the trap had been laid by Count Dooku in order to test General Grievous, the Supreme Commander of the Confederacy's droid army and a notorious Jedi hunter.
Vebb and the Republic forces discovered that they were indeed in the general's castle shortly before he arrived. The group initially planned to engage the Kaleesh general, however Grievous was able to kill most of the clones and escape Vebb, Fisto, and Fil. The three were trapped in the castle and hunted down by Grievous, during which time Vebb became increasingly angered and aggressive. When he saw an opportunity to kill the general, Vebb took it against his former master's orders. The Mon Calamari was quickly slain by Grievous; however his death bought Fisto enough time to escape the castle.