Film director Lasse Hallström discovered Glanzelius from the television series and asked him to try out for the lead role of Ingemar of the film, "My Life as a Dog", along with about 1,000 other young actors. At first, Glanzelius was told that he was too young and too small for the part, but received another call a week later. "They said they couldn't find anyone better to do it than me," Glanzelius says. "I thought it would be fun and exciting. And it was. But we worked from morning to the night for 80 days. It was very hard. I was happy to get even a 5-minute break."