School bully Bart begins menacing his classmates, especially Albert. Tired of the constant harassment, Albert creates a paper maché werewolf mask to terrorize Bart into ceasing his bullying behavior. It works, until Carrie opens her mouth! It takes a joint effort by all of Bart's classmates to make him stop bullying.
During a visit to a farmer's convention in Milwaukee, Charles and Caroline meet up with old school mates. Charles learns that larger farmers are trying to put his small farming friends out of business and urges them to stand up for their profession. Meanwhile, Caroline becomes envious about the financial fortunes of their one-time friends, but she soon learns there's more to their success stories than meets the eye.
On a dark and stormy night, Laura and Mary are staying alone at the School For the Blind when they are taken hostage by a trio of escaped convicts. One of the criminals is badly injured, and his cohorts demand to see a doctor. Laura is sent to get Dr. Baker, warned that the consequences will be deadly if she tries any tricks. However, a terrified Laura tells her Pa what is happening. Charles shows up posing as Dr. Baker, but when the real Dr. Baker arrives, Charles is forced to be resourceful to disarm the crooks.
Laura takes a job tutoring a deaf boy named Daniel, teaching him how to communicate through sign language. Daniel makes more than an academic breakthrough - he develops a huge crush on Laura! Laura doesn't know quite what to do, and makes some mistakes along the way in dealing with her situation.
Albert experiments with smoking in the basement of the School For the Blind and, when shooed out of the basement, hides the still-lit pipe in some cloths. The pipes ignite and result in a late-night fire that kills Alice Garvey and Mary's baby son. As a result, several people struggle with the consequences: Albert becomes completely withdrawn when he learns his careless actions may have caused the fire, Mary in deep shock and Jonathan Garvey in an alcohol-induced state of denial.
Albert, Mary and Jonathan - all deeply impacted by the fire at the School For the Blind - continue to deal with their emotions. Charles helps Jonathan realize that his alcoholism has taken a toll on his son, Andy, while Mary snaps out of her shock when she hears the melody of the music box Albert had purchased for her as a gift. But Mary's initial panic soon becomes Albert's when he finally understands his carelessness caused the fire that killed her baby and best friend's mother. Albert runs away, leading Charles and a reformed Jonathan to frantically search for the ...
Almanzo's indolent brother, Perley, comes to town. Knowing that Almanzo's interest in a much younger Laura has deepened, Charles is convinced that Perley is the better man for his "Half Pint." However, those sentiments quickly change when Perley injures one of Almanzo's horses. Two things become clear to Charles: Perley is a troublemaker, and Almanzo is a responsible young man (especially when he nurses the horse back to health).
Nels finally loses patience with his henpecked family life and begins a mobile merchant business. During one of his stops, he meets a much younger woman whom is the exact opposite of his own wife. In the process, Nels struggles with temptation and going astray as the relationship blossoms.
On Eliza Jane's recommendation, Laura gets her first teaching job out of town. Almanzo offers to drive her to and from the school, and their relationship continues to blossom. But a hitch is thrown into the whole thing when he sees one of Laura's students touching her in a seemingly romantic fashion, causing a misunderstanding that could jeopardize their relationship.
The romantic futures of longtime rivals Laura and Nellie take shape in the sixth season finale. First, Almanzo proposes to Laura, but Charles says that the marriage is on hold until Laura's 18th birthday. When Laura decides to honor her father's request, Almanzo feels that Laura is perhaps not mature enough to make a commitment and leaves town. Meanwhile, the Olesons ponder closing Nellie's Restaurant but decide to give it one last chance when they hire Percival Dalton, the man who will turn Nellie's rude, snotty demeanor and poor work ethic around 180 degrees. ...
Almonzo buys land for he and Laura to begin their life together on, but Laura is upset over his refusal to allow her to teach after they are married. Meanwhile Miss Wilder falls for a friend of Almonzo's.
Eliza Jane fibs and says that she is getting married to Harve Miller who had come to help Almanzo take care of their property while Almanzo was working on the new land. She says this so that Laura will take over the Walnut Grove school and she won't have to go away to teach. Since she is leaving, that leaves the house for Almanzo and Laura. They decide to get married on Adam and Mary's anniversary so that the men can help each other remember when it is! When Charles goes to get the priest he sees Harve Miller in town and asks if he wants to surprise Eliza Jane and ...
Two young brothers, deserted by their parents and desperately trying to stay together, run away from the Sleepy Eye orphanage on the eve of an adoption that will separate them, and find an unlikely ally in grumpy old handyman, Houston Lamb.
A girl who likes Almanzo but whom Almanzo doesn't like back is back in town. She wrote a song that she got published and she told Almanzo the title "My Only Love". Almanzo wrote the title down and the name of the girl. Laura saw it and thought he was cheating on her and they have many misunderstandings. Charles is trying to install a picture window. He buys three of them because Laura keeps breaking them when she slams the door at the "little house" when she goes home because she doesn't even want to sleep at the same house, and then the next time when she climbs on ...