Despite putting up exemplary ratings during its first three seasons, because of Dan Harmon being let go, which led to a lackluster fourth season. He returned for the final two seasons but cast like Donald Glover and Yvette Nicole Brown ultimately left and new characters were brought in.
However, despite the hardships they faced, the sitcom centered around a community college in Colorado came together to pull off one last spectacular run that managed to give audiences everything they needed in order to say goodbye to Greendale and it's students.
Basic Email Security, Episode 6 (7.6)
Everybody has a few skeletons in the closet and the of the study group were no exception. However, things come to a head during this episode when a hacker breaks into Greendale's database and stole sensitive information on everyone in the school.
It turns out, the hacker did it so that he could blackmail Greendale into canceling a scheduled show for a racist comedian, but the study group doesn't back down. Unfortunately, their decision results in all of their personal info being made public, but they do manage to catch the hacker in the end.
Basic Crisis Room Decorum, Episode 3 (7.7)
The whole rivalry between Greendale College and City College felt very labored after six seasons (mainly because it never amounted to anything). But the shenanigans continued to roll during this episode when it's revealed that City College plans to attack Greendale with a televised ad highlighting the fact that Greendale once gave a degree to a dog.
Annie, the only one truly upset by the attack, plans to transfer to City College after the rest of the Save Greendale Committee turns on her... only for the group to apologize and convince her to stay.
Laws of Robotics & Party Rights, Episode 5 (7.7)
When the school gets a chance to earn $300,000 if they let convicts attend classes (via telepresence robots) the SGC jumps at it. However, after one of the robot-convicts begins to swoon the students, faculty, and Dean, Jeff becomes suspicious. Things only get worse when the robot-convict tries to murder Jeff (quite unsuccessfully) and nobody believes Jeff when he tells them.
Eventually getting suspended from work due to attacking the robot, Jeff squares off against the robot-convict in a machine-vs-machine battle, where Jeff comes out victorious.
Grifting 101, Episode 9 (7.7)
Jeff fancied himself a con-man (due to his fake lawyer career) so he felt no need to the rest of the SGC when they chose to take "Grifting." However, once the professor of the class, DeSalvo, cons the SGC and insults Jeff for being a "liar" instead of a "grifter," the committee makes it their business to grift him.
Throughout the episode, DeSalvo seemingly dodges all of the SGC's attempts at conning him, managing to even get himself injured on school property and win $50,000 in the settlement... only for his own ruse to be conned by the SGC, causing DeSalvo to get fired on the spot.
Ladders, Episode 1 (7.8)
Fans were sad when season 6 arrived and Shirley wasn't around, but the series tried to fill her void by introducing Frankie, a consultant who was hired to help save the school. Immediately, Frankie starts making some drastic changes that the rest of the study group (and the school) aren't too thrilled with, resulting in the group going behind Frankie's back in order to "stay the same."
However, once a few too many problems arise and the SGC can't control the chaos, the Dean is forced to bring Frankie back and take her advice on how to fix the school.
Intro to Recycled Cinema, Episode 8 (7.9)
Somehow (in between episodes) Chang had managed to receive a part in a national commercial, immediately became famous, and moved out to L.A. So, when Abed revealed that he had been shooting a movie with Chang as the star, a film producer told Abed that he'd pay big-bucks for a final product.
The episode then revolves around the SGC trying to help Abed finish the rest of his film, doing their best to work with the shots Abed already had from his movie with Chang. In the end, the film gets finished, but something goes wrong with distribution when Chang insults Steven Spielberg and derails his acting career, forcing Chang to come back to the school.
Queer Studies & Advanced Waxing, Episode 4 (8.1)
The Dean found himself in a pickle during this episode when he s the school board (in attempts to be an openly-gay role model) only to eventually come to regret his decision (due to the fact that he doesn't consider himself strictly gay). Meanwhile, the school's wi-fi goes down due to a bird's-nest being built in the router; forcing Abed and Elroy to try and save the birds once the nest gets moved.
While all this happens, Annie does her best to help Chang bring out his inner "Mr. Miyagi" for an adaptation of The Karate Kid, but eventually gets herself recast while Chang gives an emotionally compelling performance.
Wedding Videography, Episode 12 (8.6)
This episode took one heck of a turn. Garrett and Stacy get engaged in the beginning and their wedding immediately follows, with the SGC showing up to the ceremony late and accidentally making a scene. As a result, the group does everything they can to make amends and not cause problems for the rest of the evening... only for it to be revealed (via a speech from Jeff) that Garrett and Stacy have the same grandmother (making them cousins).
After some debate from the crowd, and a moving speech from Chang, Garrett and Stacy eventually decide to stay married anyway.
Modern Espionage, Episode 11 (9.0)
Despite the series taking a break from the paintball-episodes for a few seasons, the show ultimately brought back the staple for one last go-around. When Frankie warns Greendale that a game of paintball-assassin won't be permitted (or she'll fire/expel whoever plays), a "secret-game" pops up with students getting picked off one-by-one.
By the end of the episode, it's revealed that the secret game has been orchestrated by the janitors in order to make Frankie quit as they don't like how she's improving the school, only for Frankie to promise nobody will lose their jobs if they stop the game and it their mistakes (which they do).
Emotional Consequences of Broadcast Television, Episode 13 (9.5)
Fans are still waiting on the movie. After six seasons came and went, the meta-series decided to give its fans a proper send-off by spending the entire finale "pitching" ideas for what a potential season 7 would look like. After some truly terrible ideas from a few of the group , Jeff finally manages to come up with an idea that makes sense - everybody should return to Greendale as teachers.
However, real-life kicks in when Abed and Annie both announce that they've accepted jobs on opposite sides of the country. With that, and one final goodbye to the study room, the group splits up and they all go their separate ways. But, seriously - still waiting for the movie.