The Cerritos finds itself in a standoff with the Drookmani over the salvage of an old Starfleet ship. Mariner and Boimler's friend, Ensign Fletcher, offers to recalibrate the ship's isolinear cores for them, so the two can leave work early to attend a concert. They return to find him the victim of an attack, with the shield core missing. Rutherford shows off his new holographic assistant, an anthropomorphic Starfleet badge named Badgey, to Tendi in the holodeck. The Drookmani begin to attack the Cerritos, now without shields, causing a holodeck malfunction. This results in Badgey becoming homicidal and attacking Rutherford and Tendi. They defeat him by changing the holodeck program to a mountaintop which freezes Badgey. Boimler and Mariner discover Fletcher staged the attack because he was unable to complete the work. The missing core goes on a rampage before being blown it out of an airlock. It drifts to the Drookmani ship and disables it. Fletcher is rewarded for stopping the Drookmani with a transfer to the USS Titan, where he is shortly discharged.
(Synopsis courtesy of Wikipedia)

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