John Foster
Charlene "Charlie" Railsberg
Matt
Mrs. Whitney "Muffy" Hyde
Harris Pell (as Pete Kowanko)
Peter
Grant Railsberg
Seth Railsberg
Steve
Tommy John
Mrs. Daniels
Red
Auditor
Charlie is a 16-year-old orphan struggling to raise her two younger brothers when she endeavors to train a wild horse she names Sylvester and turn him into an Olympic jumping champion.