From publisher blurb:
Now you can bring the superheroes from the days of yore to your SUPERS! games. This edition of Public Domain supers includes 10 Supers! both heroes and villains.
Included in this set are:
Amazing Man, Der Hyena, Amazona, Ant Queen, Great Question, The Claw, Air Man, Black Phantom, Brain Men of Mars, and Dr. Martinious