Story: "Yesterday's Sins, 1 of 4: Back in the Days" (22 Pages)

Credits:

Chuck Dixon (plot, script)
Joe Staton (pencils)
Terry Beatty (inks)
Albert De Guzman (letters)
Anthony Tollin (colors)
Kevin Dooley (edits)

Feature Character:

Guy Gardner (last in Action Comics #688; also appears in flashback to childhood following flashback in Guy Gardner: Warrior #0 and preceding flashback in issue #12)

Supporting Characters:

General Glory I (next in issue #16)
Graf Toren
Bivvix
RRU-9-2
Voz
Gpaak (five captured Green Lanterns)
Rolly Gardner (Guy's father)
Peggy Louise Gardner (Guy's mother; first appearance of both; both in flashback in between flashback in Guy Gardner: Warrior #0 and flashback in issue #12)
Mace Gardner (Guy's older brother; behind the scenes in flashback in between flashback in Guy Gardner: Warrior #0 and flashback in issue #12)

Villains:

The Kobra Cult
The Draal (first appearance; an alien race from the Takk Nebula)
a Xanoglyph (mindless creature used to transfer Guy's memories into his clone)
Joe Gardner (first appearance; Draal-created clone of Guy)

Guest Appearances:

Wonder Woman
Blue Beetle II
Martian Manhunter

Other Character:

Hal Jordan's clone (first appearance)

Comment: Blue Beetle II is erroneously shown in costume, although he wouldn't don it again until Guy's clone was in the League.