Mike and Molly's wedding day is finally here. Molly has a rough day - first the salon messes up her hair, then the limo is towed, then Victoria's car breaks down. The sisters are forced to walk through a sketchy neighborhood and eventually hitch a ride to the church with Victoria's hippie pot dealer. 

At the church, Mike tries to convince Carl not to propose to Christina. Carl does anyway, and Christina turns him down. She loves him, but doesn't want to rush things. 

Peggy reveals that her rekindled romance with Jack is all a plot to get her revenge against her ex husband.

Finally, Molly arrives at the church. She and Mike exchange vows and their friends and families cheer.