Eager to spend the summer at camp, the young Jönsson gang finds itself instead at a punitive, hardscrabble institution run by their archenemy.
Charles-Ingvar "Sickan" Jönsson
Ragnar Vanheden
Dynamite - Harry
Doris
Wall-Enberg Junior
Biffen
Director Wall-Enberg
Miss Rask
Märta Gabrielsson
Professor Rixil
Miss Fridh
Janitor
Loket
Junior's friend
Junior's friend
Stig
Ulf
