|"Anthropology 101": Shirley is happy that Jeff and Britta seem to be dating now and reveals to the study group how the couple hooked up during the paintball competition the previous year.
"The Psychology of Letting Go": Shirley is clearly upset that Annie and Britta are working on a project together and didn't include her in it .
"Messianic Myths and Ancient Peoples": Shirley's attempt to get Abed interested in working on a religious youtube video for her church inspires him to make the ultimate meta film.
"Epidemiology": The students at the school Halloween party become infected and crazed chasing Ben Chang and Shirley into the library restroom. The two share a moment and have sex but a government cover up erases their memories of the incident.
"Aerodynamics of Gender": Shirley, Britta, Annie and Abed take a Women's studies course and run afoul of Meghan and her mean girl clique. Thanks to Abed the Mean Girls are overthrown and the quartet takes their place as the new clique to be feared.
"Cooperative Calligraphy": A pregnancy test Shirley has in her purse is discovered and she is forced to admit she has reconnected with her ex-husband Andre and might be pregnant.
"Mixology Certification": Shirley's past as an alcoholic is discovered when the study group goes to a bar she used to frequent to celebrate Troy's 21rst birthday.
"Asian Population Studies": Shirley introduces her ex-husband Andre to the study group and Troy and Pierce reveal that Chang could possibly the father of her baby.
"Celebrity Pharmacology 212": Chang tries to get closer to Shirley but she ignores him.
"Intermediate Documentary Filmmaking": Pierce plays mind games with the study group pretending to be on his death bed and bequeathing them things to mess with them. He gives Shirley what he claims is a candid recording of the study group mocking her.
"Custody Law and Eastern European Diplomacy": Shirley tries to get Jeff to convince Chang to abandon all parental rights he may have over the her baby.
"Paradigms of Human Memory": Shirley and the study group get into yet another argument with each other with them recalling previous arguments they have had.
"Applied Anthropology and Culinary Arts ": Shirley gives birth in the Anthropology classroom with the help of Britta and Chang and the baby's true parentage is reveale.
"For A Few Paintballs More": A City College VS Greendale College paintball war errupts and Shirley joins Troy's commando unit to spring a trap for the invaders. Later, with the help of Britta and the Campus security patrol cart, Shirley makes a last ditch assault on City Colleges paintball machine gun nest.