Julius and Juliana are twins. Julius wants to become a better ice hockey player. He practices a lot, not even caring for Christmas. Worried, Juliana visits the school nurse Vera, who says practicing to hard is dangerous. Vera has invented a shrinking machine, which she shows Juliana. Juliana is shrunk down and enters Julius' body travelling inside small a yellow, submarine-like vehicle.[2]
References
^"Hjärtats hjältar" (in Swedish). Svensk mediedatabas. 2004. Retrieved 5 April 2011.
^"Hjärtats hjältar" (in Swedish). Sveriges Radio. 2004. Retrieved 4 December 2014.