Little House on the Prairie - Season 5 - Eps 14: The Godsister
In this episode starring twins Lindsey and Sidney Greenbush, Charles takes a job on a telephone crew that is working in southern Minnesota, which requires him to be away from home for several weeks. Carrie, heartsick for her Pa and craving attention, only manages to get into everybody else's way, so the lonesome tyke creates an imaginary friend, Alyssa, to ease the pain.
About Little House on the Prairie

Title: Little House on the Prairie
First Air Date: 1974-09-11
Last Air Date: 1983-03-21
Status: Ended
Rating: 7.9/10 (from 923 votes)
Language: EN
Seasons: 10
Total Episodes: 200
Network: NBC
Genres: Western, Drama, Family
Production Companies: Worldvision Enterprises, Ed Friendly Productions, NBC, NBC Studios
Synopsis
When the big woods of Wisconsin becomes a difficult spot for hunting, Charles Ingalls reluctantly decides to move his family, pioneering west. Their life on the farm in Walnut Grove, Minnesota, in the 1870s and 1880s is full of adventure, tragedy, and triumph. Based on the books of Laura Ingalls Wilder.
Cast

Melissa Gilbert
Laura Ingalls

Dean Butler
Almanzo James Wilder

Katherine MacGregor
Harriet Oleson

Richard Bull
Nels Oleson

Jonathan Gilbert
Willie Oleson

Allison Balson
Nancy Oleson

Lindsay Kennedy
Jeb Carter

David Friedman
Jason Carter

Shannen Doherty
Jenny Wilder

Pamela Roylance
Sarah Reed Carter