Data courtesy of the Grand Comics Database under Creative Commons license.

Issue Details

Issue	#56
Published	May 1969
Frequency	Monthly
Cover Price	0.12 USD
Pages	36
Editing	Stan Lee

Cover Details - "What is... the Power?"

Characters	X-Men [Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Henry McCoy]]; The Living Monolith
Genre	superhero
Pencils	Neal Adams
Inks	Neal Adams?; Tom Palmer?
Letters	Typeset
Notes	Disputed inker credit--Tom Palmer per Steve Whitaker, Nick Caputo, and Bob Ford; Neal Adams per Carl Gafford, Michael Evans, and the original indexer.
Reprinted	in X-Men Classics Starring the X-Men (Marvel, 1983 series) #1

15 page X-Men story "What Is...the Power?"

Characters	X-Men [Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Henry McCoy]]; Alex Summers [Havok] (origin continued); The Living Monolith [also as Living Pharaoh] (villain)
Genre	superhero
Script	Roy Thomas
Pencils	Neal Adams
Inks	Tom Palmer
Colors	Neal Adams
Letters	Herb Cooper

5 page The Origins of the Uncanny X-Men! story "The Flying A-Bomb!"

Characters	X-Men [Angel [Warren Worthington III] (origin conclusion); Cyclops [Scott Summers]; Iceman [Bobby Drake]]; Professor X [Charles Xavier]; Fred; Alma
Genre	superhero
Script	Roy Thomas
Pencils	Werner Roth
Inks	Sam Grainger
Letters	Sam Grainger
Reprinted	in Marvel Special (Marvel Italia, 1994 series) #5

1 page Marvel Bullpen Bulletins promo (ad from the publisher) "Awe-Inspiring Announcements to Yawn With!"

Script	Stan Lee; ?
Letters	typeset
Notes	Stan's Soapbox. Miscellaneous Marvel news items. The Might Marvel Checklist for titles dated June 1969.

2 page Mutant Mail-Box letters page "Mutant Mail-Box"

Letters	typeset
Notes	Letters from readers - George D. Schaetzle, M. Brogdon, Michael Fortier, Kent Roberts, Greer Watson, John Monhomme and Todd Freeman, Jr.