Comic Title: New Mutants #21
Publisher: Marvel
Cover Date: November 1984
On Sale Date: July 24, 1984 Newsstand Date July 24, 1984
Source: Amazing Heroes, #51

Newsstand Date July 24, 1984
Source: Marvel Age, #17, #19

Newsstand Date July 24, 1984
Source: Comic Reader, #219

Shipping Date July 3, 1984
Source: Comic Reader, #219

Shipping Date July 3, 1984
Source: Amazing Heroes, #51

Shipping Date July 3, 1984
Source: Marvel Age, #17, #19

Copyright Date July 3, 1984
Source: Library of Congress, Copyright Office 1984
Marvel copyright dates beyond April 1969
represent shipping dates NOT newsstand sale dates

Cover Price: $1.00
Page Count: 48
Editor: Ann Nocenti

Title: "Slumber Party"
Pages: 35

Feature(s):
New Mutants

Writer: Christopher S. Claremont
Artist: Bill Sienkiewicz
Letterer: Tom Orzechowski
Colorist: Glynis Wein (Oliver)

Reprinted In:
New Mutants:The Demon Bear Saga TPB (1991)
Marvel Visionaries:Chris Claremont HC (2005)
New Mutants Classic Vol. 3 TPB (2008)
New Mutants Epic Collection:The Demon Bear Saga TPB (2019)
New Mutants Omnibus Vol. 1 HC (2021)
New Mutants Omnibus Vol. 1 HC [Variant] (2021)