Retired detectives Bud (Bud Abbott) and Lou (Lou Costello) find themselves helping accused killer Tommy Nelson (Arthur Franz) when he convinces them of his innocence. When the police attempt to arrest Tommy he eludes them by injecting himself with an invisibility serum created by the uncle (Gavin Muir) of his fiancée, Helen (Nancy Guild). Tommy now persuades Lou to find the real killer by going undercover as a boxer, and is forced to help the little fellow out when he has to show his mettle in the ring
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