The Vulcan-made cybernetic implant fitted to the head of Ensign Sam Rutherford of the USS Cerritos, which enhances his engineering skills and conceals a secret about his past.
Rutherford's implant covers one eye and part of his skull. It gives him enhanced vision, direct access to data and various modes he is still learning to use when Star Trek: Lower Decks begins.
In the first-season finale No Small Parts, Shaxs tears the implant out during the escape from a Pakled ship, apparently at the cost of his own life. The loss wipes much of Rutherford's recent memory, and a replacement is fitted. Rutherford gradually suspects that he never chose the implant.
Reflections reveals a buried earlier personality, and The Stars at Night confirms that Admiral Buenamigo had it installed after an accident to erase Rutherford's memory of helping to write the flawed artificial intelligence code later used in the Texas-class ships.