The precinct gains a new detective who has just completed a 12-year undercover job with the mob, Charles' latest mess prompts the janitors to refuse to clean the precinct, and Gina directs a video for Holt.
When an unstable detective returns to the Nine-Nine after years undercover, Jake doesn't know what to make of him. Meanwhile, Charles' rebellious behavior pits him against the precinct's custodian, and Holt enlists Gina's help in directing a "fun and informational" video starring himself and Rosa.