When Sivana's attempt to run Billy Batson over with a car fails, he orders Batson to be kidnapped and brought to his lair. Unfortunately, the thug sent to accomplish the deed, finds four Billy Batsons at his residence, so the three visiting Billys are taken away, and the real Billy must rescue the Three Lieutenant Marvels from Sivana and his thugs as Captain Marvel.; Captain Marvel saves a defecting Nazi pilot, who fled to America when Hitler began enslaving people in the European nations. The man tells Cap about a secret Nazi project in the western shore of Europe, and when he investigates, discovers (and later destroys) an invasion tunnel Adolf Hitler is having dug beneath the Atlantic Ocean.; Billy is assigned to cover the Giggy Colton trial and witnesses the murder of a top witness again the criminal. When the prosecuting attorney threatens to dig up more evidence against Golton, Captain Marvel must prevent his murder.; Captain Marvel dresses in civilan clothes to see what is happening around town and runs into an informer, who tells Marvel about a secret Nazi submarine base being established in South America.