An idealistic but struggling actor finds his life unexpectedly complicated when he stops a robbery while wearing the costume of Captain Avenger, a superhero character of a film he is hired to promote. He decides to dabble at being a superhero only to find that it is more difficult and dangerous than he ever imagined.

When Emil travels by bus to Berlin to visit his grandmother and his cousin, his money is stolen by a crook who specializes in digging tunnels. Emil must get the money back as it is for his grandmother. While following the thief, Emil runs into Gustav, an enterprising young boy who gathers up all his friends to help Emil find the money. Emil's cousin also gets involved and they get into more trouble than they bargained for when Emil's pickpocket turns out to be mixed up with a couple of notorious bank robbers.