Pamela Sue Martin
— Abby
Betsy Slade
— Muffy
Parker Stevenson
— Michael
George O'Hanlon, Jr.
— Malcolm
Karen Balkin
— Laura
Debralee Scott
— Ann
Nora Heflin
— Emmy
Kathryn Holcomb
— Helen
Roderick Cook
— Headmaster
Edith Atwater
— Mrs. Pendleton
Marijane Maricle
— Miss Picard
Meg Wyllie
— Nurse
Mary Jackson
— Miss Moran
Carol Arthur
— Gym Teacher
Hope Summers
— Biology Teacher
Jerry Hardin
— Mr. Keats
Robert Walden
— Frank
Luke Andreas
— Marge
Darrell Zwerling
— Dr. Madden
Lou Frizzell
— Dr. Freeman
Michael Gray
— Buzzy
Helene Winston
— Mrs. H
Helen Baron
— Mrs. Reed
Cliff Emmich
— Hotel Clerk
Herbert Nelson
— Minister
James Brodhead
— St. Ambrose Headmaster
Christopher Man
— David
Diana Webster
— Mrs. Clairmont
Ron Kolman
— Jamie Clairmont
Bob Harks
— Party Guest (uncredited)