"Anthropology 101": Troy is upset with Jeff for "hogging the doughnuts"; Pierce discovers Troy has been quoting him on a Twitter account called "Old White Man Says".
"Accounting for Lawyers": Troy helps reveal that Alan Connor ratted out Jeff to the state bar and later participates in the Pop and Locktoberfest.
"The Psychology of Letting Go": Troy deals with finding Pierce's mom dead.
"Basic Rocket Science": Troy assumes control of the "Eleven Herbs & Space Experience" when the Winnebago, along with him and the rest of the study group, are towed off school property before it's debut at a press conference announcing it as part of Greendale's new space program.
"Messianic Myths and Ancient Peoples": Troy stars in Abed's apology to Shirley movie about Jesus.
"Epidemiology": At a school sponsored Halloween party, Troy reverts back into his original jock persona as a horrifying epidemic grips the rest of the attendees.
"Aerodynamics of Gender": Jeff and Troy discover a secret place which contains a trampoline and is tended to by the school groundskeeper Joshua.
"Cooperative Calligraphy": Troy placates everyone when they can't find Annie's pen by telling a story where a ghost took the pen.
"Conspiracy Theories and Interior Design": Troy and Abed build a blanket fort at the school.
"Mixology Certification": Troy celebrates his twenty first birthday at a bar with the rest of the study group.
"Abed's Uncontrollable Christmas": Troy becomes Troy Soldier is Abed's Christmas fantasy world and prevents the Christmas Wizard from stopping Abed from going to the North Pole. he later hits the Christmas Wizard with nun chucks.
"Asian Population Studies": Troy tells Shirley about a voice mail message he received from Chang that stated that she and Chang hooked up on Halloween.
"Celebrity Pharmacology 212": Troy is a bee in Annie's anti-drug play and gets hit in the face with a baseball thrown by the middle school audience.
"Advanced Dungeons & Dragons": Troy is Bing Bong the Archer in the D&D game.
"Early 21st Century Romanticism": Troy has a friendly competition with Abed for the affections of librarian Mariah. When Troy wins he finds her criticism of Abed unbearable and leaves her for Abed.
"Intermediate Documentary Filmmaking": Troy meets his idol LeVar Burton.
"Intro to Political Science": Troy and Abed broadcast the student president election on GCTV.
"Custody Law and Eastern European Diplomacy": Troy and Abed try to prevent Britta from dating their new friend Lukka.
"Critical Film Studies": Dressed as "Pumpkin" for a "Pulp Fiction" theme birthday party for Abed, Troy becomes jealous of Jeff's gift for Abed and ends up ruining it.
"Competitive Wine Tasting": Troy takes an acting class with Britta and lies about a past traumatic experience which gets him top marks in class and also the attention of Britta who becomes attracted to him.
"Paradigms of Human Memory": Troy suffers a nose bleed when the study group starts arguing about how they always argue.
"Applied Anthropology and Culinary Arts": Troy and Abed sell their signature handshake to Pierce.
"A Fistful of Paintballs": It's revealed in a flashback that Troy voted Pierce out of the study group.
"For A Few Paintballs More": Troy and Jeff fight over the leadership of the remaining Greendale students while trying to take back the school from Dean Spreck and his City College Storm Troopers.