Kasok was a Vulcan Alliance scientist in an alternate timeline caused when Montgomery Scott rescued James T. Kirk before he could be absorbed into the Nexus, with the USS Enterprise-D following them into the past.

Supreme Arbiter of the Alliance Sarek personally appointed Kasok to the observation team that monitored the Vortex from Alliance Outpost Number 3. In 2293, Kasok contacted the Wisdom and requested that Commander Varkan and Sarek investigate a mysterious ship that had appeared only a few thousand kilometers from the spacial anomaly. Although Sarek suspected the vessel had come out or warp or decloaked, Kasok showed him the visual recording from observation platform number two displaying the ship coming into existence as if out of nowhere. As the Wisdom was the only vessel within range, Sarek agreed to intercept and investigate what eventually turned out to be Scott's shuttlecraft, the Goddard. (Star Trek novel: Engines of Destiny)

It is uncertain if a Kasok existed in the primary timeline.
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