Detective Comics (Volume 1) with a cover date of August, 1937.
Synopsis for Speed Saunders: "The Mystery of the Lost Ape"
A ship from Borneo brings a gorilla for the city's zoo, but on the beast's first night there, it is stolen. A mad scientist places a human brain into the gorilla's body, to prove it's possible. Bad consequences prove to be possible too.
Appearing in Speed Saunders: "The Mystery of the Lost Ape"
Featured Characters:
Supporting Characters:
Villains:
- Roskoffin (Single appearance; dies)
Animals:
- gorilla with human brain
Locations:
- Borneo (Mentioned only)
Items:
Vehicles:
Synopsis for Larry Steele: "Mystery of the Wholesale Kidnappings (Part 2)"
Appearing in Larry Steele: "Mystery of the Wholesale Kidnappings (Part 2)"
Featured Characters:
Supporting Characters:
- Bill Graham
- Tom (First appearance)
Villains:
- Dutch (First appearance)
- Squinty (First appearance)
Other Characters:
Locations:
Items:
Vehicles:
Synopsis for Cosmo, the Phantom of Disguise: "The Disappearing Diamonds"
Appearing in Cosmo, the Phantom of Disguise: "The Disappearing Diamonds"
Featured Characters:
Supporting Characters:
- Bruce Shaw (Single appearance)
Villains:
- Mr. Jaeger (Single appearance)
- Lunt (Single appearance)
Other Characters:
Locations:
Items:
Vehicles:
Synopsis for Bruce Nelson: "The Claws of the Red Dragon (Part 6)"
Appearing in Bruce Nelson: "The Claws of the Red Dragon (Part 6)"
Featured Characters:
Supporting Characters:
Villains:
- Joseph Stucchi
- Chin Lung
Other Characters:
- Sigrid von Holtzendorff
- Erick von Holtzendorff
Locations:
Items:
Vehicles:
Synopsis for Gumshoe Gus: "A Bum Disguise"
Appearing in Gumshoe Gus: "A Bum Disguise"
Featured Characters:
- Gumshoe Gus
Supporting Characters:
Villains:
Other Characters:
Locations:
Items:
Vehicles:
Synopsis for Bart Regan, Spy: "The Investigation of Captain Hanley"
Appearing in Bart Regan, Spy: "The Investigation of Captain Hanley"
Featured Characters:
Supporting Characters:
Villains:
- Captain Hanley (Single appearance)
Other Characters:
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Synopsis for Mr. Chang: "The Mad Scientist"
Mr. Chang defeats a mad scientist, Dr. Hugo Von Gratz, who is creating giant slaves by injecting people with chemicals.
Appearing in Mr. Chang: "The Mad Scientist"
Featured Characters:
- Mr. Chang
Supporting Characters:
- Wu
Villains:
- Dr. Hugo Von Gratz (Single appearance; dies)
- Egor (Single appearance)
- Ludwig (Single appearance)
Other Characters:
- Inspector Daniels
- Howard (Single appearance)
- Jean (Single appearance)
Locations:
Items:
Vehicles:
Synopsis for Slam Bradley: "In Mexico"
Mexican gold-mine owner, Mr. Cortez, meets Slam Bradley on his American trip. He and his daughter Rosita become good friends with Slam and Shorty. A week after their departure back to Mexico, Slam receives a message from Rosita telling them that her father has been kidnapped by bandits. Now two companions have an exciting Mexican trip to take.
Appearing in Slam Bradley: "In Mexico"
Featured Characters:
Supporting Characters:
Villains:
- Don Carlos (Single appearance)
- Pedro (Single appearance)
Other Characters:
- Alvardo Cortez (Single appearance)
- Rosita Cortez (Single appearance)
Locations:
Notes
- Published by Detective Comics, Inc..
- At this time, More Fun Comics and New Adventure Comics were still being published by "Nicholson Publishing Co., Inc."
- This issue Gumshoe Gus returns, last seen in Detective Comics #2, for one last appearance.
- Last issue for Mr. Chang.
- Mr. Chang villain, Hugo Von Gratz, has got exactly the same modus operandi as a later Detective Comics villain, Hugo Strange.
- Speed Saunders villain, Roskoffin, has got exactly the same modus operandi as three later Action Comics villains: Dr. Kichung (Action Comics #8), Herbert Handers (Action Comics #19), and the Ultra-Humanite (Action Comics #20).
- This almost certainly was the earliest interspecies brain transplant to take place in a DC Comic.
See Also