Ook, a Cragmoloid standing ten feet tall, was a slave from the Cragmoloid race.
Ook, together with another Cragmoloid named Noba, was abducted from their home world, Ankus, the native planet of the Cragmoloids. Subsequently, they found themselves in the "zoo" of slaves belonging to the slaver Phylus Mon, who may have been responsible for their initial kidnapping. During their captivity, they were compelled to learn the Basic language, achieving a functional proficiency. Around 20 BBY, after an unknown duration of enslavement, both Ook and Noba continued to experience longing for their home.
Bin Kohal, a Shistavanen assassin held in the adjacent cell, contemplated the sheer size of both Ook and Noba in the context of a potential escape strategy. Their large stature meant they would occupy considerable space on any escape vessel. A large-scale escape would necessitate the use of multiple ships.
Phylus Mon implanted an explosive device close to each of his slaves' heart through surgical means. This explosive was designed to detonate upon Phylus Mon's death, however, it could also be disabled by the impact of an ion weapon. Furthermore, all the slaves confined within Phylus Mon's zoo were routinely subjected to physical abuse.