Parkour!: Pulp

A virtual newsstand from the summer of 1925. Source.

The first appearance of the character Red Sonia. Source.

The Digital Comic Museum. Free and Public Domain Comic Books. Free to download.

Thousands and thousands and thousands.

Source. As the old story pulps gave way to "men's magazines" in the 1950s just before the "men's" magazines would give way to Maxim, Esquire and softcore porn--here's a Man vs. Animal yarn typical of the format--in which a post-war American Heman battles . . . turtles. (Weirdly) a thing. Other foes these men would battle: snakes, weasels, cannibal crabs, otters, flying squirrels and nazis.

Source.

"How many faces passing you on the street are hungry with loneliness? How many poor human creatures like you and me are trapped into desperate measures to escape the pain of being always alone! Perhaps you'll understand better when you know my life story and why . . . "

Source. Because every pop culture meme deserves its own planet.

Hop-Frog - Edgar Allan Poe (1850)
Hop-Frog - Edgar Allan Poe

The Black Coats (1863+)

Les habits noirs - Paul Féval (French only)

Dr. Nikola (1895-1901)
Dr. Nikola's Experiment by Guy Boothby
Dr Nikola Omnibus

Fantômas (1911)
Fantômas
Being the Second of the Series of the "Fantômas" Detective Tales
Messengers of Evil
Being a Further Account of the Lures and Devices of Fantômas

Fu Manchu (1913)
The Insidious Dr. Fu Manchu by Sax Rohmer
Clones
The Mysterious Wu Fang: The Case of the Suicide Tomb - Robert J. Hogan
The Sinister Dr Wong

Les Vampires (1916)

The Black Star (1916)
The Black Star

The Spider (1918)
The Spider Strain

Belphegor (1927)

The First Chapter (in English)
Belphégor the phantom of the Louvre (1965 Film Adaption)
Belphegor info and backgrounder at Cool French Comics

The Man Who Laughs (1928)

The Scarlet Slamander (1930)
The Scarlet Salamander

The Scarlet Ace (1932)
The Scarlet Ace

Doctor Satan (1933)
Mask of Death
Weird Tales/Volume 28/Issue 2

The Lightning (1938)

The Octopus (1939)
The City Condemned to Hell

The Scorpion (1939)
Satan's Incubator by Randolph Craig

Mesmerists

Svengali (1899)
Trilby by George Du Maurier

Thanks Dangerous Minds! (Thanks Adrianne Kulling for posting to my FB wall).

Source.
c/f The Circular Staircase by Mary Roberts Rinehart

Some context.

From the Broadway production.

First film adaption.

(The 1930 sound film remake of this same film "The Bat Whispers" Bob Kane identified as partially inspiring Batman).

Hoodoo Plays the Hero by Mel Pitzer
December, 1944
"A dog who causes unintentional havoc in an Allied airbase finally proves his value."

Kid Brother by David Goodis
December, 1944

"A conscientious objector from a family with a long military tradition finally finds a reason to fight. This is a typical WW2 flag-waver, though slicker than most. Goodis excels in the dogfight sequence - vivid, gut-wrenching stuff. The touches of British life are straight out of "Mrs. Miniver", but no real harm in that."

Customized Search Engine for free, public domain downloadable pulps.

Interestingly, Jerry Siegel and Joe Shuster first conceived Superman as a bald telepathic villain bent on world domination. Kind of more like Lex Luther, in fact. Herbert Fine is the pen name chosen by the young collaborators. That provisional outing can be viewed here.