Comic Title: X-Factor #18
Publisher: Marvel
Cover Date: July 1987
On Sale Date: April 14, 1987 Newsstand Date April 14, 1987
Source: Marvel Age, #51

Newsstand Date April 15, 1987
Source: Amazing Heroes, #114

Shipping Date March 24, 1987
Source: Marvel Age, #51

Shipping Date March 24, 1987
Source: Amazing Heroes, #114

Newsstand Date April 7, 1987
Source: Comics Buyers Guide, #692, #694, #696

Copyright Date March 24, 1987
Source: Library of Congress, Copyright Office 1987

Shipping Date March 24, 1987
Source: Comics Buyers Guide, #692, #694, #696

Shipping Date March 24, 1987
Source: House Ad, Comics Buyer's Guide #694, Page 21

Cover Price: $0.75
Page Count: 32
Editor: Bob Harras

Title: "The Enemy Within"
Pages: 22

Feature(s):
X-Factor

Writer: Louise Simonson (Jones)
Penciller: Walter Simonson
Inker: Bob Wiacek
Letterer: Joseph Rosen
Colorist: Petra Scotese (Goldberg)

Reprinted In:
Essential X-Factor Vol. 2 TPB (2007)
X-Men:The Fall of the Mutants Omnibus HC (2022)
X-Men:The Fall of the Mutants Omnibus HC [Variant] (2022)
Phoenix Omnibus Vol. 2 HC (2023)
Phoenix Omnibus Vol. 2 HC [Variant] (2023)