Episode: 069 | Aired: September 19, 1977
Charles and Mary take their first trip to Chicago only to discover that big city life isn't exactly what they were expecting.
Episode: 070 | Aired: September 26, 1977
A woman who refuses to accept that her daughter is dead kidnaps Laura.
Episode: 071 | Aired: October 03, 1977
When Charles is called away to make a delivery, Caroline hires an attractive woodsman to build the new addition onto the Ingallss house. The chemistry between the two makes Mary think her mother is falling in love with a new man.
Episode: 072 | Aired: October 17, 1977
Charles and Caroline go away on a trip and make Mary responsible for her younger siblings. While Mary is learning to deal with her new tasks, Laura stumbles upon a few baby wolves.
Episode: 073 | Aired: October 24, 1977
Laura and Andy Garvey try to get to the bottom of a Walnut Grove crime spree. But their detective work only gets them into hot water, especially with Pa Ingalls.
Episode: 074 | Aired: October 31, 1977
Distraught over the death of one of his patients, Doc Baker decides he cannot handle the demands of being a doctor. The insensitive behavior of the new town doctor helps Doc Baker reconsider his decision.
Episode: 075 | Aired: November 07, 1977
Notorious gangsters Jesse and Frank James try to blend in with the rest of Walnut Groves citizens. Their cover is blown when law enforcement officials arrive searching for them.
Episode: 076 | Aired: November 14, 1977
After their barn and crops are destroyed, Mrs. Garvey takes a job at the post office to help support the family. Mr. Garvey is furious and contemplates divorce, but comes to realize how his chauvinistic beliefs are destroying his family.
Episode: 077 | Aired: November 28, 1977
The Ingalls family and the Olesons take a trip to the fair, where two men compete for Mary's affections, Nels and Charles join a donkey-riding race and Carrie tries to take a nap but ends up having an adventure.
Episode: 078 | Aired: December 05, 1977
Mr. Simms and his son, Luke, move into Walnut Grove. Mr. Simms falls for Miss Beadle and Luke and Nellie fall for each other.
Episode: 079 | Aired: December 12, 1977
A young American Indian man travels to Walnut Grove to seek help for his terminally ill father. (
Episode: 080 | Aired: January 09, 1977
Charles tries to save his business from a competitor while Laura vies for the love of a young man.
Episode: 081 | Aired: January 16, 1978
Mary accepts her very first teaching job but is shocked when she is opposed by a town leader who disapproves of education.
Episode: 082 | Aired: January 23, 1978
Its Charles and Carolines wedding anniversary, and Charles is delayed in getting home. To pass the time, Caroline shares stories of their romance.
Episode: 083 | Aired: February 06, 1978
Charles discovers that he will inherit a large sum from a rich relative. The news brings unwanted attention from a suspicious new friend, Mrs. Oleson.
Episode: 084 | Aired: February 20, 1978
The Olesons become guardians to Nelss young nephew when the boy is sent to Walnut Grove after repeated conflicts at home. When the Olesons realize they can't handle the difficult child, Nels asks Charles to step in.
Episode: 085 | Aired: February 27, 1978
Caroline is thrilled to be expecting her fifth child, but obsessed about the babys gender. She desperately wants to give Charles a son. When Caroline delivers her baby early, Charles steps in to play doctor.
Episode: 086 | Aired: March 06, 1978
The Ingalls family is devastated when Mary goes blind. Terrified and angry, Mary withdraws from life, and Doc Baker urges Charles and Caroline to enroll her at a school for the blind in Iowa.
Episode: 087 | Aired: March 13, 1978
Mary is enrolled at a school for the blind, but she is deeply frightened, angry and resentful. Adam Kendall, a kind and unwavering instructor, helps her to rekindle her love for learning, and a romance blossoms between the two.
Episode: 602 | Aired: November 21, 1977
Charles is set to fight in a boxing match, but he doesn't realize that his opponent is a very sick man. After losing the match, the opponent discovers that another fight will end his life. Guest star: Moses Gunn.
Episode: 603 | Aired: January 30, 1978
Laura discovers a letter in a bottle. While searching for the author of the note, Laura and her father find a baby.