Adventure Comics (1938) 64-A

Starman in "The Mystery of the Men with Staring Eyes"
Starman vs. Prince Ahmed, a criminal hypnotist.

Steve Carson and the Federal Men in "The Rock Prison Poisonings"

Steve Conrad in "The Brazilian Vipers"

Hourman in "The Little Men Who weren't There"
Hourman vs. Dr. Iker, a scientist that creates a giant and dwarves to help him commit crimes.

Paul Kirk in "Manhunter Behind Bars"

Cotton Carver in "The Bears of Barok"

Sandman in "The Unseen Man"
The Sandman versus a criminal using a special fluid which turns anything washed in it invisible.