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The Nine-Nine host the detectives from their neighboring precinct, the Nine-Eight, which reunites Jake with his old partner and causes Charles to become jealous. Meanwhile, the rest of the precinct attempt to be welcoming, but the plan doesn't go well.
Jake's skeptical of an unstable detective who returns to the precinct after years undercover. Meanwhile, Charles' rebellious behavior pits him against the custodian; and Holt enlists Gina's help to direct an informational video starring himself and Rosa.