No Small Parts

Boimler inadvertently reveals to the crew that Mariner is Freeman's daughter. The Cerritos picks up new crew members, including an Exocomp—a sentient robot—named Peanut Hamper. They receive a distress call from the USS Solvang and find it destroyed by the Pakleds, a group of unintelligent aliens who have become a threat while being ignored by Starfleet. They begin tearing apart the Cerritos. Rutherford plans to disable the Pakled ship using a computer virus developed by Badgey. Peanut Hamper refuses to deliver the virus, forcing Lieutenant Shaxs and Rutherford to fly a shuttle to the Pakled ship. Badgey uploads the virus but also engages the ship's self-destruct in an attempt to kill Rutherford. Shaxs takes Rutherford's cybernetic implant and sacrifices himself to help Rutherford escape; Rutherford loses his long-term memory.

Summary from Wikipedia, CC BY-SA 4.0.