"Biology 101": Pierce is welcomed back to the study group while at the same time Jeff finds himself forced out.
"Geography of Global Conflict": Pierce participates on Annie's Model UN team representing Somalia which he describes as a paradise.
"Remedial Chaos Theory": In several timelines, Pierce tries to not only tell a story about hooking up with Eartha Kitt on an airplane but also give Troy a housewarming gift, the Norwegian troll doll.
"Competitive Ecology": After the other study group members pair off as Biology lab partners, Pierce finds himself the odd man out again having to team up with an outsider named Todd.
"Horror Fiction in Seven Spooky Steps": In a Halloween pre-party, Pierce tells a story in which is he Magnum PI and punches out gangsters represented by Troy and Abed.
"Advanced Gay": Pierce attempts to launch a new Hawthorne Wipes product for the Gay community but is stopped by his father, Cornelius Hawthorne.
"Studies in Modern Movement": Pierce offers to help Annie fix a broken plug outlet in the apartment she is moving out of so she can keep her deposit.
"Documentary Filmmaking: Redux": Pierce acts like a diva and refuses to participate in a shoot on campus for a new Greendale commercial until his demands are met.
"Foosball and Nocturnal Vigilantism": Pierce is seen very little but does respond to the question "What's everyone doing this weekend?" with "the question is who am I doing".
"Regional Holiday Music": Pierce convinces Shirley to join the Glee Club's Christmas performance by bringing in a children's choir who sing about lack of awareness that Christmas is about Jesus.
"Contemporary Impressionists": Pierce dresses as "Fat Brando" (or "Fat Burt Reynolds" depending on your perspective) for a celebrity impressionist Bar Mitzvah.
"Urban Matrimony and the Sandwich Arts": Shirley and Pierce go into business together and pitch an idea to Dean Pelton for a new sandwich shop in the cafeteria.
"Digital Exploration of Interior Design": Pierce and Shirley try to use Britta to bring down the student representative of the Subway franchise.
"Pillows and Blankets": While participating in the war between Troy's blanket fort and Abed's pillow fort, Pierce comes up with the ultimate weapon of mass destruction: Pillow Man.
"Origins of Vampire Mythology": Pierce tries to become best friends with Ben Chang.
"Virtual Systems Analysis": Pierce admits he sat on his balls and "saw eagles".
"Basic Lupine Urology": Pierce runs a game betting on seniors who are arm wrestling.
"Course Listing Unavailable": Pierce helps to incite a riot in the cafeteria where a wake for Star-Burns is being held and ends up expelled along with the rest of the study group.
"Curriculum Unavailable": In a possible reality where the Study Room is in a mental hospital, Pierce says he is a millionaire, an inventor, a legend and had sex with Eartha Kitt.
"Digital Estate Planning": Pierce and the study group are forced to play a video game to win his inheritance.
"First Chang Dynasty": Pierce infiltrates a Chang controlled Greendale dressed as a swami as part of an elaborate plan to rescue Dean Pelton and end Chang's rule.
"Introduction to Finality": Pierce hires Alan Conner to represent him in a case against Shirley for the right to be named sole owner of the sandwich shop.