Comic Title: Action Comics #644
Publisher: DC (DC Comics Inc.)
Address: 666 Fifth Avenue, New York, NY
Cover Date: August 1989
On Sale Date: July 4, 1989 Shipping Date July 4, 1989
Source: Previews, #4

Shipping Date July 6, 1989
Source: Amazing Heroes, #168

Direct Market Date July 6, 1989
Source: Comic Shop News, #106

Copyright Date July 4, 1989
Source: Library of Congress, Copyright Office 1989

Frequency: Monthly
Cover Price: $0.75
Page Count: 32
Editor: Mike Carlin

Title: "Doppelganger"
Pages: 22

Feature(s):
Superman (Post-Crisis)

Writer: Roger Stern
Writer/Penciller: George Perez
Inker: Brett Breeding
Letterer: Bill Oakley
Colorist: Glenn Whitmore

Reprinted In:
Superman in the Eighties TPB (2006)
Superman:The Exile & Other Stories Omnibus HC (2018)
Adventures of Superman:George Perez HC (2020)

Feature Character(s)

• Superman (last appearance in Adventures of Superman #457; next appearance in Adventures of Superman #458)

Supporting Character(s)

• Jonathan Kent (last appearance in Adventures of Superman #457; next appearance in Adventures of Superman #462)
• Martha Kent (last appearance in Adventures of Superman #457; next appearance in Adventures of Superman #462)
• Lana Lang (last appearance in Adventures of Superman #457; next appearance in Action Comics #645)
• Matrix (last appearance in Adventures of Superman #457; no further appearances)

Guest Appearance(s)

• Starman (last appearance in Starman #13; next appearance in Starman #14)
• Kitty Faulkner (last appearance in Starman #13; next appearance in Starman #14)

Other Character(s)

• Alvin Fitch (a building inspector; no further appearances)

Cameo Appearance(s)

• General Zod (from the Pocket Universe; in Matrix's vision)
• Quex-Ul (from the Pocket Universe; in Matrix's vision)
• Zaora (from the Pocket Universe; in Matrix's vision)

Synopsis:
Superman returns to Smallville after receiving a phone call from Lana Lang. He arrives to find that Matrix has been mentally altered by the Eradicator and now believes that she is Clark. A fight ensues between Superman and his confused Doppelganger. Superman is finally able to break through and convince Matrix of the truth. Seeking to break the mental link with Superman, Matrix leaves Smallville and the Earth behind.