When Mindy's cheating ex-boyfriend Josh invites her to his wedding, Mindy panics to find a date and begrudgingly decides to take Peter, who is actually a great wedding date until he makes one big mistake. Meanwhile, Danny's kid brother Richie is in town to make a big announcement.

In an attempt to get in shape before a weekend away with Cliff, Mindy convinces Danny to be her personal trainer. Meanwhile at the office, Peter finds himself in over his head when he has to act as managing partner while Jeremy is out sick.