Dr. Quinn's mother in Boston is ill. Dr. Quinn takes the children to Boston.

Dr. Quinn has met a very nice doctor in Boston and is conflicted about staying.

Dr. Mike and Sully go to Rev Johnson for a honest discussion regarding their upcoming marriage.After originally agreeing they have no conflicts, the couple begin reliving their past difficulties via prior show clips since they first met.

The town of Colorado Springs is preparing for an event of a lifetime, the marriage of Sully and Dr. Mike. Unexpected guests include Dr. Mike's mother Elizabeth Quinn and two of her sisters Rebecca and Marjorie. They have brought with them enough Boston finery to pull off a splendid society wedding. Meanwhile General Custer has put out a bounty on Cloud Dancing which could interfere with the wedding.

Bolstered by the long-awaited arrival of the railroad, the citizens of Colorado Springs busily prepare for the biggest social event in the town's history, the wedding of Dr. Mike and Sully. The first train carries some surprise visitors, Dr. Mike's mother, Elizabeth, and sisters Marjorie and Rebecca, who have unexpectedly traveled all the way from Boston for the occasion. However, their elaborate wedding plans threaten to ride roughshod over the townsfolk's more homespun arrangements. Sully, meanwhile, is crestfallen to learn that Gen. Custer has placed a bounty on the head of his close friend Cloud Dancing, who he had planned to have as his Best Man.

Dr. Mike's mother and two of her sisters arrive with a young Dr. Cook to deliver the baby. Conflict arises between Horace and Myra which ruins Preston's hotel groundbreaking. Sully works to prevent Cloud Dancing's transfer to another reservation.

Dr. Mike leaves in the night to treat Sully, who was wounded by sergeant O'Connor while helping Cloud Dancing. She goes into labor with only Sully to assist her.

When Colleen, who is working on a college paper, asks Dr. Mike to recall her most memorable case, Dr. Mike looks back on the five turbulent years she's lived and loved in Colorado Springs. As they sit with Andrew, who is mysteriously ill at the clinic, Dr. Mike reminisces about her tumultuous career -- its successes and its failures -- and realizes how many divergent cases she has seen and treated. When Andrew's condition takes a turn for the worse, Dr. Mike warns Colleen about the fine line between emotional involvement and professional detachment, an issue with which she has long struggled in the frontier town that's now her home.

Dr. Mike's mother and oldest sister visit for thanksgiving just as an outbreak of diphtheria hits Colorado Springs.

Dr. Mike struggles to control the diphtheria outbreak and disagrees with Andrew on whether to use a new treatment.