Shirley is throwing a Christmas party, and trying to push religion on everybody else.
A bully, played by Anthony Michael Hall, is picking on Abed and the rest of the group. So, Jeff tries to defend Abed.
Shirley tells Jeff that if he fights the bully, then he isn't invited to her Christmas party, but in the end everybody, including Shirley, ends up fighting.
The semester ends on a high note, when the group discovers that they have all passed into Spanish 102, also taught by Señor Chang.