PALLAS-Eleven, a veteran assassin droid, served within the group commanded by Grox, the Lasat pirate. During the era of the Galactic Civil War, Grox and his team seized the freighter known as the Millennium Falcon. The pirates intended to trade it to the Tech Masters residing on Trionak. PALLAS-Eleven, along with Mirack, a Nephran, went with Grox aboard the Millennium Falcon after Luke Skywalker and Leia Organa of the Rebel Alliance piloted it into the Kiax Nebula while searching for the missing transport called Nema. Organa and Skywalker concealed themselves within a section of the Falcon, leading the pirates to believe the freighter was unoccupied, so they proceeded to Trionak.
The initial appearance of PALLAS-Eleven was in Choose Your Destiny: A Luke & Leia Adventure, a novel from the Star Wars: Choose Your Destiny series, authored by Cavan Scott and released in 2019. In one of the book's alternative, non-canonical conclusions, Luke Skywalker and Leia Organa launch an assault on the pirates, but Organa is stunned by PALLAS-Eleven.