Aut-O on the bridge of his flagship
During the Clone Wars, Commander Aut-O commanded a fleet consisting of mainly Recusant-class light destroyers and one Providence-class Dreadnought. His flagship carried an encryption module that was needed to decipher a coded transmission General Grievous sent to his allies. Meanwhile, the D-Squad infiltrated Aut-O's command ship with a stolen Confederate shuttle, intending to steal the module. The droid squad, led by colonel Meebur Gascon, got past the battle droid security, and got to C-Deck, where the module was being held. After multiple energy fluctuations, Aut-O decided to investigate the phenomena. Taking several B1-series battle droids and B2-series super battle droids with him, Aut-O made his way to C-Deck, where he discovered D-Squad attempting to steal the encryption module.
He first held R2-D2 at gunpoint, but the plucky astromech turned off the gravity, causing all the droids to float helplessly around. Aut-O's escort was completely destroyed by the Republic forces, while Aut-0 tried to stop R2 and to eliminate Colonel Gascon. In the process, Aut-O held tight onto R2's legs, trying to stop the droid, but R2 burned and melted the super tactical droid's hands with his rocket boosters. Suddenly, Gascon jumped onto Aut-O's head, kicking the droid's optical sensors. Aut-O only defeated Gascon by shaking his head, but the pesky Zilkin regained strength and jumped back at Aut-O, who started firing on him. Aut-O was hit out of nowhere by WAC-47 holding a droid leg. Aut-O struck back in retaliation and knocked down WAC, who was distracted by Gascon. With WAC out of the way, Aut-O continued to pull down R2, who had gotten to the module. Aut-O tried at the same time to pull down the astromech and swat Gascon who was nearby.
Aut-O's decapitated head
In the end, WAC-47 reactivated the gravity. Aut-O fell, then crushed Gascon. Witnessing this, R2 purposely dropped onto Aut-O, beheading him. As a result, D-Squad took possession of the encryption module. Yet after Aut-O's death, he sent a distress signal that triggered an alarm. However, battle droids on patrol mistook D-Squad for crew members, allowing the squad to flee Aut-O's flagship.
Aut-O was voiced by Dee Bradley Baker, who voices the clone troopers in Star Wars: The Clone Wars.