There's an excellent episode of Star Trek Voyager where the Borg crewmate Seven of Nine installs a component into her brain that lets her sift through Voyager's

There's an excellent episode of Star Trek Voyager where the Borg crewmate Seven of Nine installs a component into her brain that lets her sift through Voyager's immense dataset, and results in her secretly telling the first officer that she believes that the captain is a part of a grand and dark conspiracy. Then she runs the dataset again, and goes to the captain to say the exact same thing about the first officer.