Laura and Mary's plans to raise money for the pastor's birthday by investing the Sunday-school funds backfire.
Isaiah Edwards attempts to bond with his newly adopted son and buys him a rifle so that the pair can go hunting together; his son, an avid reader, has no interest in hunting.
When Caroline is away with Mary at an arithmetic championship, Laura has a hard time filling her mother's shoes at home.
A deadly infection fells Caroline before she can join her family on a camping trip.
Charles and Mr. Edwards end up racing against time to rescue Mary, Laura and a friend from a runaway caboose.
During a recession, Charles and Mr. Edwards join two others in order to transport the highly explosive liquid dynamite.
Rumors fly when Charles performs odd jobs for a widow to get a china set for Caroline.
A Russian emigrant (Theodore Bikel) objects to cancellation of the centennial party.
A gentle and sensitive musician returns to Walnut Grove to resume his career as a teacher.
A tornado that destroys crops convinces a desolate Charles to sell the farm and go back to his old home.