Comic Title: Adventure Comics #421
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: July 1972
On Sale Date: May 30, 1972 Newsstand Date May 30, 1972
Source: House Ad, Adventure Comics #420, Page 46

Newsstand Date May 30, 1972
Source: Comic Reader, #84

Newsstand Date May 30, 1972
Source: Direct Currents, Wanted, the World's Most Dangerous Villains #1

Copyright Date May 30, 1972
Source: Library of Congress, Periodicals 1972

Frequency: Monthly (semi-monthly, Mar.)
Cover Price: $0.20
Page Count: 32
Editor: Joe Orlando

Title: "Demon Spawn"
Pages: 18

Feature(s):
Supergirl (of Earth-1)

Plotter: Marv Wolfman
Scripter: Steve Skeates
Penciller: Mike Sekowsky
Inker: Robert Oksner

Feature Character(s)

• Supergirl (last appearance in Adventure Comics #420; next appearance in Adventure Comics #422)

Villain(s)

• Nasthalthia Luthor (last appearance in Adventure Comics #418; next appearance in Adventure Comics #422)