The X-Men (vol. 1) #40 (Jan. 1968):
“The Mark of the Monster!”
by Roy Thomas, Don Heck, George Tuska

The X-Men (vol. 1) #40

Title: “The Mark of the Monster!”

Medium: comic

Cover date: Jan. 1968

Publisher: Marvel

Written by: Roy Thomas

Art by: Don Heck, George Tuska

8 characters in this story:

(Click links for info about character
and his/her religious practice, affiliation, etc.)
Pub. #
Cyclops Cyclops (Scott Summers) hero
CBR Scale: ICBR Scale: S Protestant; mutant supremacist
The Twelve; X-Factor...  Marvel 2,604
The Beast The Beast (Hank McCoy) hero scientist
CBR Scale: ICBR Scale: S Episcopalian; agnostic
Brotherhood of Mutants; The Defenders...  Marvel 5,233
Phoenix Marvel Girl (Jean Grey) hero
CBR Scale: I Episcopalian
Metro College; X-Men...  Marvel 1,905
Iceman Iceman (Bobby Drake) hero
CBR Scale: I Jewish Catholic
The Twelve; The Champions...  Marvel 1,752
Angel Angel (Warren Worthington III) hero
CBR Scale: I Episcopalian
X-Force; X-Saviours...  Marvel 1,741
Changeling Professor X (Kevin Sydney) hero
  X-Men; Factor Three Marvel 23
Professor X Professor X (Charles Xavier)
(someone disguised or dressed as)
hero scientist
CBR Scale: S religious
The Mutant Underground (founder); Brotherhood of Mutants...  Marvel 4,999
Frankensteins Monster Frankenstein's Monster
(character based on)
  S.H.A.D.E.; First Line... 
[Uses name Frankenstein in tribute to his creator.]
Marvel DC 990