Thunk was a Gorn and an officer in the Klingon Defense Force serving as Science officer aboard the I.K.S. Masamune.

In 2410, he joined Captain Deloss on the holodeck taking the role of Watson in the Sherlock Holmes program where they inadvertently released another Moriarty hologram. Later, he was part of the Away Team which tracked a Crystalline Shard aboard the disabled U.S.S. Crucial.