Mindy's friends and co-workers unintentionally throw her the worst birthday party ever. And, after storming out, Mindy stumbles upon a new group of friends with whom to celebrate. But when she ends up in a fight with her new pals, she receives help from someone in her recent past. Meanwhile, Danny and Jeremy compete for the affection of Mindy's friend.

When Mindy goes on a date with a cute minister named Casey, she feels compelled to attend his church to show him that she is a good person. But when Casey admits to Mindy that he thinks she's a selfish person, she decides to go on the practice's volunteer trip to a women's prison to prove him wrong.