Wojo starts to worry when he convinces himself that Luger is planning to commit suicide; the police detectives investigate a string of unusual robberies and are led to a gun collector; a man attempting to get his television robs the police vault.
When other members of the 12th Precinct celebrate the department's annual day of uniform, Detective Harris shows up wearing his usual streets clothes; Harris gets in an argument with Barney when he won't change his clothes. Quincy and Sam are sent to a small town in Arizona after several residents become afflicted with a mysterious disease, and their quest to hunt down the source of the illness leads them to the doorstep of one of the town's most despised citizens.
Beaver is glad at first to hear that Penny Woods' family will be moving away to Bellport and she will be transferring schools, but as her departure draws closer, Beaver begins to decipher his true feelings about Penny and she, him.
Beaver volunteers to be in the school's upcoming pageant, but to his dismay, he is playing a cute bunny rabbit and must get dressed at home before coming to school, so when Ward has to work late, Beaver has to find a new ride or risk walking. The entire Douglas family is mystified when someone decide to mail Bub a saddle for a race horse; Chip takes his new girlfriend out for a pony ride.
With their graduation day approaching quickly, Mike and Jean decide to test the strength of their relationship by spending some time apart from each other.
