Since Dwight's departure, Andy had been clinging to Michael. Andy's antics had been wearing very thin on his co-workers. In fact, Andy left Jim actually wishing Dwight would come back.
Oscar returned to work from his "gaycation". Angela took it upon herself to ask Oscar if he wanted to be part of the all-female party planning committee. He wanted to know if he was only asked because he was gay. Angela broke down and started crying and Oscar agreed to join the committee in hopes she would stop crying.
Andy was getting on Jim's nerves and Jim wanted to pull an ultimate prank on him. He asked Karen to go in with him on the prank, but she declined, as did Ryan. Jim eventually went to Pam and she enthusiastically agreed to go along with Jim in pulling a prank on Andy.
Since Dwight's resignation from Dunder-Mifflin, he got a job at Staples. He was doing well in the sales department, but creeping out some of his customers. He also wasn't rubbing his co-workers the right way.
Michael ordered a Mexican party in celebration of Oscar's return. This meant Mexican lemonade and pi'atas. Pam tried to get assistance from Angela, who appeared to be very sad. She confirmed that she was sad. She later admitted to Michael the real reason why Dwight went to New York, to do the job she forgot to do.
Jim and Pam teamed up and stole Andy's phone when he was not looking. Jim hid the phone in the ceiling of the office and he and Pam took turns calling it. This was driving Andy mad, especially when he kept hearing his ring tones, but couldn't tell where they were coming from. Andy was becoming unhinged in front of all his co-workers.
After Andy punched a hole in Michael's office wall, Michael went on a mission to find Dwight at Staples. Michael admitted his mistake in accusing Dwight of hitting on Jan. He said Angela came clean with everything. Dwight realized that Angela didn't come clean out their relationship and was disappointed. Michael wanted Dwight to come back to Dunder-Mifflin and Dwight accepted the job offer.
After witnessing how close Jim and Pam were getting, Karen was becoming insecure with her own relationship. She got Jim alone and asked him he still had feelings for Pam. Jim paused for a moment and admitted that he did still have feelings for her. Karen collected her thoughts and then left the room.
Dwight returned back to Dunder-Mifflin. Angela was delighted that her knight in shining armor was back to work. Oscar's party all of a sudden had turned in Dwight's party, complete with Dwight getting the first crack at all the pi'atas.