Chu'lak joined Starfleet in the 24th century, and was commissioned as an ensign in 2355. Chu'lak was assigned to the USS Strata under Captain Jason Stone. The chief medical officer on that ship, Doctor Martin Rackham, discovered at that time that Chu'lak had a minor psychological instability. (DS9 episode: "Field of Fire")
- Doctor Rackham was named for the actor who played Chu'lak onscreen in "Field of Fire."
Chu'lak was one of only six survivors. The trauma of the loss of his ship and crew members lead to severe psychological problems for Chu'lak, who was then assigned to Deep Space 9. Shortly after arrival Chu'lak went on a killing spree, using a TR-116 rifle to murder three other station residents who had pictures in their quarters of people smiling and/or laughing, in other words showing emotion. He was stopped by Lieutenant Ezri Dax after she discovered this connection. When Ezri asked for his motive, Chu'lak, characteristic of his instability, replied that "logic demanded it." (DS9 episode: "Field of Fire")
In 2376, Quark tested Ro Laren's knowledge of Deep Space 9's past, asking her who Chu'lak was. Ro knew he was a Starfleet officer who went on a killing spree, but thought he was Andorian, rather than Vulcan. (DS9 novel: Ferenginar: Satisfaction is Not Guaranteed)
|USS Grissom personnel|
|USS Grissom (NCC-638, Oberth-class)||J. Esteban • Fred • D. Marcus • Saavik • unnamed USS Grissom (NCC-638) personnel|
|USS Grissom (NCC-42857, Excelsior-class)||Boyajian • M. Calhoun • Chu'lak • Cray • N. Kenyon • T. Kogutt • R. McLauren • T. Oliver • C. Parsons • P. Simons • Villers|