Allst Prime was a backwater planet where Governor Magé rule over an impoverished population during the Galactic Empire's reign. Between 2 BBY and 0 BBY, the Rebel Alliance's 61st Mobile Infantry was deployed into Allst Prime to destroy the Imperial outpost there. During the battle, the rebel soldier, secretly a bounty hunter, Brand rescued one of her comrades and then joined Captain Micha Evon to incapacitate Magé at her headquarters. Brand then collect to get a bounty on Evon, but the captain convinced her to stay with the 61st.
Allst Prime was a backwater planet with forests, at least one city, an Imperial outpost, and an Imperial headquarters.
During the Galactic Empire's reign, Allst Prime was governed by the administrator Magé, who lived in luxury in the planet's Imperial headquarters while the residents in the nearby city lived in poverty, half-naked children digging through trash heaps for junk to sell for food. Between 2 BBY and 0 BBY, the Rebel Alliance's 61st Mobile Infantry was deployed to the planet to destroy the Imperial outpost. The rebel soldiers of the 61st engaged Imperial forces on Allst Prime.
The locals of Allst Prime did not put up much resistance to the 61st's arrival. During the fighting, the rebel soldier Brand—secretly a bounty hunter sent to kill the 61st's Captain Micha Evon—rescued her Mirialan comrade Lylee Anaraku from an AT-ST walker. After the pair exchanged, Brand aimed her blaster at a distant Evon, who was filling in for the fallen Forward Air Controller Cait. Anaraku was then injured by an Imperial who Brand killed before she tended to her Mirialan friend.
Later, Brand and Evon entered the Imperial headquarters and incapacitated Governor Magé and her aide at the governor's officer. At Magé's office, Brand drew her blaster on Evon to take the bounty on him. However, Evon had already learned of the bounty hunter's background and motives and discussed it to her, convincing her to stay with the 61st for the soldiers she had become close to.
Allst Prime appeared in "Inbrief," a short story written by Janine K. Spendlove that was illustrated by Jose Cabrera and first published in Star Wars Insider 161 on November 10, 2015.