Chester was the pet cat of Liam Bilby at his home on Farius Prime in 2374. After Bilby was killed during an operation for the Orion Syndicate, Miles O'Brien took Chester to Deep Space 9. (DS9: "Honor Among Thieves")

Later that year, Molly wanted to bring Chester with them on a trip to Golana. Keiko, who didn't particularly like the cat, feared that Chester might run away. (DS9: "Time's Orphan")