I: The Crooner; V: The Crooner's double (I) and Doc (I)
A criminal alters his looks so that he resembles a popular singer. The singer's doctor carries him around in a large instrument case and lets him out to rob audiences. They do this to establish an alibi for the theft. The women tell the police that they were robbed by the singer, and yet the singer was onstage at the time. The doctor gives the police some psychobabble about how the women are deeply influenced by the singer and they imagine him to be the thief and the police buy into this story and release him. When Cap and Bucky confront the doctor on a train, the duplicate tosses a knife in close quarters combat and the doctor takes it in the back. Cap hands the duplicate over to the police.