Issue Details

Issue	#40
Published	January 1968
Cover Price	0.12
Pages	36
Editing	Stan Lee

Cover Details

Characters	The X-Men (Angel, Beast, Cyclops, Iceman, Marvel Girl); The Frankenstein Android
Genre	superhero
Pencils	George Tuska
Inks	George Tuska
Reprinted	in X-Men (Marvel, 1963 series) #88; in X-Men: First Class Giant-Size Special (Marvel, 2008 series) #1

15 page X-Men story "The Mark of the Monster!"

Characters	The X-Men (Angel, Beast, Cyclops, Iceman, Marvel Girl); I: The Frankenstein Android (I, D; not the Frankenstein Monster); Changeling
Genre	superhero
Script	Roy Thomas
Pencils	Don Heck
Inks	George Tuska
Letters	Artie Simek
Notes	Professor X secretly replaced by Changeling through issue #43.
Reprinted	in X-Men (Marvel, 1963 series) #88; in Marvel Special (Marvel Italia, 1994 series) #14; in X-Men: First Class Giant-Size Special (Marvel, 2008 series) #1

5 page Origins of the Uncanny X-Men!, The story "The First Evil Mutant!"

Characters	O: Cyclops (continued); V: Jack O'Diamonds;
Genre	superhero
Script	Roy Thomas
Pencils	Werner Roth
Inks	John Verpoorten
Letters	Al Kurzrok
Reprinted	in Amazing Adventures (Marvel, 1979 series) #3 (February 1980); in Marvel Special (Marvel Italia, 1994 series) #4