Baddon Fass, a male individual, was a Dark Jedi who served as a member of Emperor Palpatine's Dark Side Elite. In the year 10 ABY, he and fellow darksider Zasm Katth were sent to the moon of Nar Shaddaa with a specific assignment: to find the Millennium Falcon, the celebrated starship of New Republic heroes Han Solo and Leia Organa Solo. After failing to enlist the aid of bounty hunter Boba Fett for this mission and failing to assassinate the Jedi Vima-Da-Boda, who was in hiding on the moon, Fass and Katth went back to their Star Destroyer, the Invincible, hoping to intercept the Falcon as it departed Nar Shaddaa. In an attempt to ensnare the ship using a tractor beam, the darksiders cranked it up to maximum power. However, instead of the Falcon, they pulled the massive Traffic Control spire into the Star Destroyer, causing catastrophic damage and the ship's destruction, which resulted in the Dark Jedi's death.
Baddon Fass, a male being, was a Dark Side Adept working for the Galactic Emperor Palpatine. As a seasoned darksider under Palpatine's reign and one of his most trusted followers, Fass was inducted into the Dark Side Elite, an exclusive group of Dark Jedi formed after Palpatine's resurrection in a clone body. Following the Emperor's subsequent defeat, and while the Empire awaited his return, the leader of the Dark Side Elite, Executor Sedriss QL, took command of the Imperial forces and initiated Operation Shadow Hand.
As part of this operation, Fass and his fellow darksider Zasm Katth were deployed in 10 ABY to the moon of Nar Shaddaa aboard the Star Destroyer Invincible with a multi-faceted mission. Their orders included contacting bounty hunter Boba Fett to enlist his help in locating the Millennium Falcon, the starship of renowned New Republic heroes Han Solo and Leia Organa Solo. Fass and Katth were also tasked with reporting any sightings of the Falcon to Sedriss and eliminating the Jedi woman Vima-Da-Boda.
While stationed on the Invincible, Fass and Katth observed the Falcon arriving on the moon. They attempted to lock onto it with a tractor beam, but the vessel evaded capture and disappeared into the labyrinthine alleys of the Duros Sector. The darksiders then proceeded with their original plan to recruit Fett. They confronted the bounty hunter, demanding his services without payment. When Fett refused, Fass used a Force choke to strangle him and threatened to reveal compromising information about him. As the darksiders attempted to remove Fett's helmet, he repelled them with wrist-mounted rockets, nearly killing Fass, before retreating to his ship, the Slave I. However, Dark trooper team two reported spotting the Falcon parked inside the workshop of mechanic Shug Ninx.
Fass and Katth advanced towards the workshop, but their Force senses alerted them to Vima-Da-Boda's presence nearby. Remembering their orders to eliminate her, Fass instructed the dark trooper Grath to indiscriminately fire a turbocannon at innocent bystanders, hoping to kill the Jedi hiding among them. However, the elderly Jedi managed to escape and was rescued by the Solos, who had also defeated dark trooper team two in the hangar. Upon arriving in the hangar, Fass and Katth recovered the bodies of their fallen troops and left a detachment of stormtroopers aboard the ship before returning to the Invincible. However, the Solos returned to the Falcon with Vima-Da-Boda, eliminated the stormtroopers, and took off from the moon. Mako Spince, the overseer of the Traffic Control Spire and Solo's rival, detected their escape and informed Fass and Katth of the Falcon's location.
In an attempt to capture the ship, Katth ordered the activation of the Star Destroyer's tractor beam at full power, despite Fass's reservations. Solo maneuvered the Falcon under the Traffic Control Spire, which was ensnared by the tractor beam, ripped from the ground, and pulled towards the Invincible. Realizing the danger, Katth ordered Fass to deactivate the tractor beam, but it was too late. The spire pierced the Star Destroyer's engineering section, disabling its thrusters and causing the ship to crash onto the planet's surface, killing Fass, Katth, and their crew. Meanwhile, Palpatine was reborn in another clone body, and the news of the death of his two best darksiders was not well received by the Emperor, though he soon found replacements for them.
Fass was a dark side adept who was willing to go to any lengths to achieve his goals. He showed no concern for the innocent people of Nar Shaddaa, ordering an attack on the crowd in an attempt to kill Vima-Da-Boda. He considered Fett's attack on him a personal affront and was determined to retaliate, but he was unable to do so.