Some of today's popular super hero characters were developed from or after earlier forms or prototypes. These prototype characters sometimes were introduced to test new ideas and concepts which later developed into full fledged super heroes, or old material sometimes would inspire new characters. Below is a list of all known prototypes. The Marvel/Atlas issues have been verified by Stan Lee, Steve Ditko and Jack Kirby.

Ancient One Strange Tales #92, 1/62

Ant-Man Strange Tales #73, 2/60; Strange Tales #78, 11/60

Aunt May Strange Tales #97, 6/62

Doctor Doom Tales of Suspense #31, 7/62

Doctor Strange Journey Into Mystery #78, 3/62; Strange Tales #79, 12/60; Tales of Suspense #32, 8/62

Electro Tales To Astonish #15, 1/61

Giant-Man Strange Tales #70, 8/59

Hulk Journey Into Mystery #62, 11/60; Journey Into Mystery #66, 3/61

Human Torch Strange Tales #76, 8/60

Iron Man Strange Tales #75, 6/60; Tales of Suspense #9, 5/60; Tales of Suspense #16, 4/61

Kamandi Alarming Tales #1, 9/57

Lava Men Tales of Suspense #7, 1/60

Magneto Strange Tales #84, 5/61

Mr. Hyde Journey Into Mystery #79, 4/62

Professor X Amazing Adult Fantasy #14, 7/62; Strange Tales #69, 6/59

Quicksilver Strange Tales #67, 2/59

Red Tornado House Of Mystery #155, 9-10/65

Sandman Journey Into Mystery #70, 7/61

Savage Dragon Marvel Comics Presents #50, 1990

Spider-Man Journey Into Mystery #73, 10/61

Stone Men Tales of Suspense #28, 4/62; Tales to Astonish #5, 9/59; Tales to Astonish #16, 2/61

Superman (Dr. Mystic) Comics Magazine #1, 5/36; More Fun Comics #14, 10/36; New Book of Comics #2, Spr '38

Toad Men Tales to Astonish #7, 1/60

Uncle Ben Strange Tales #97, 6/62

Watcher Tales of Suspense #35, 11/62