Set over the course of a major drug cartel bust, No Activity follows the misadventures of two low-ranking cops who spend way too much time together; two criminals who are kept in the dark; two dispatch workers who haven't really clicked; and two Mexican tunnelers who get stuck in a space unsuitable for a pair of relative strangers.
Car 27 stakes out a cockfighting ring. Cullen and Tolbeck are rattled when a hero of the San Diego Police Department falls from grace. Both Marco and his new partner-in-crime, Frankie, have a secret. Fatima falls victim to extortion.
Marco puts the entire cockfighting ring in jeopardy and must find a solution before it's too late. Fatima is forced to undergo sensitivity training. A dream scenario for Cullen and Tolbeck turns nightmarish.
The night of the cockfight arrives with unexpected results. Janice (Amy Sedaris) blames Fatima for her financial woes. Tolbeck has an unlikely admirer.
When Cullen and Tolbeck are reunited with a figure from their past, Cullen realizes that he doesn't know his partner at all. Meanwhile, Marco and Frankie open up to each other, and Janice finally unravels.
Zach, the new dispatcher at SDPD, goes to various lengths to impress Fatima. Cullen confronts Tolbeck, who admits a shameful secret.
Cullen and Tolbeck make a shocking discovery. Fatima is jealous of Zach's newfound success. Marco comes clean and his situation with Frankie comes to a head.
Marco and Frankie are victims in the nicest hostage situation ever. Fatima inserts herself in the middle of an awkward love triangle. An annoying visitor joins Cullen and Tolbeck in Car 27.
Cullen and Tolbeck are finally given the chance to save the day. Marco and Frankie consider their options, while a new - but not necessarily improved - Janice returns to Dispatch.