Uncanny X-Men (Marvel, 1963 1st Series) #40

Cover art by George Tuska. The Mark of the Monster!, script by Roy Thomas, pencils by Don Heck, inks by George Tuska.

The X-Men battle the Frankenstein monster, who is revealed to be an android. The First Evil Mutant!--The Origins of the Uncanny X-Men, script by Roy Thomas, pencils by Werner Roth, inks by John Verpoorten : the origin of Jack ODiamond, Cyclops origin continued.