Qat Zaldana was an alias used by an omnipotent being from an unknown species in which she posed as a scientist from Skagway and a member of the Order of the Faceless.
In 2270, Zaldana was sent to the USS Enterprise by Governor Skooka Dawson to help determine why Klondike VI's rings were destabilizing. Zaldana was present when the Enterprise beamed an alien probe aboard and Shaun Christopher's mind was transported into James T. Kirk's body, an event for which Zaldana was responsible. Zaldana later assured Dawson that the Enterprise was still doing it's best to solves the situation, despite Kirk's absence. When Christopher made his way to the bridge while the Enterprise was trying to examine the decaying rings, Zaldana explained the situation to Christopher, who was able to offer insight based on his own experiences around Saturn in 2020. As a result, Christopher was able to provide a solution to the situation, allowing the Enterprise to save Skagway. Zaldana was left on Skagway as the Enterprise departed, although she agreed with the senior staff to keep the secret of Kirk and Christopher's swap secret.
When the Enterprise travelled through time to recover Kirk's mind, Zaldana revealed that she was also Zoe Querez and was, in fact, an omnipotent being. (TOS novel: The Rings of Time)
- Based on the way she changed form and left the Enterprise, it is likely that Querez/Zaldana was a member of the Q Continuum, though this is never confirmed.