- Script
- Roy Thomas (credited)
- Pencils
- Chuck Patton (credited)
- Inks
- Romeo Tanghal (credited as Tanghal); Pablo Marcos (credited as Marcos)
- Colors
- Gene D'Angelo (credited)
- Letters
- David Cody Weiss (credited as Cody)
- Job Number
- J-8798
- Genre
- superhero
- Characters
- The Crime Champions: Chronos [David Clinton]; Doctor Alchemy [Albert Desmond]; Felix Faust; The Fiddler [Isaac Bowin] (Earth-Two (Pre-Crisis)); The Icicle [Dr. Joar Mahkent] (Earth-Two (Pre-Crisis)); The Wizard [William Zard] (Earth-Two (Pre-Crisis)) (also in flashback)
Justice League of America: Black Canary [Dinah Laurel Lance] (Earth-Two (Pre-Crisis)) (secret origin, also in flashback); The Elongated Man [Ralph Dibny]; Firestorm [Ronnie Raymond & Prof. Martin Stein]; The Flash [Barry Allen]; Green Lantern [Hal Jordan]; Red Tornado (Earth-Two (Pre-Crisis)); Superman [Clark Kent / Kal-El] (also in flashback); Zatanna
Justice Society of America (Earth-Two (Pre-Crisis)): The Atom [Al Pratt] (Earth-Two (Pre-Crisis)) (flashback); Black Canary [Dinah Drake Lance] (Earth-Two (Pre-Crisis)) (death in flashback); Doctor Mid-Nite [Charles McNider] (Earth-Two (Pre-Crisis)) (flashback); The Flash [Jay Garrick] (Earth-Two (Pre-Crisis)) (also in flashback); Green Lantern [Alan Scott] (Earth-Two (Pre-Crisis)) (flashback); Hawkman [Carter Hall] (Earth-Two (Pre-Crisis)) (flashback); Hourman [Rex Tyler] (Earth-Two (Pre-Crisis)); The Huntress [Helena Wayne] (Earth-Two (Pre-Crisis)); Power Girl [Kara Zor-L] (Earth-Two (Pre-Crisis)); Starman [Ted Knight] (Earth-Two (Pre-Crisis)); Johnny Thunder (Earth-Two (Pre-Crisis)) (also in flashback); Wonder Woman [Diana Prince] (Earth-Two (Pre-Crisis)) (flashback)
Black Canary [Dinah Drake Lance] (Earth-Two (Pre-Crisis)) (corpse); Jim Corrigan (Earth-One, host of The Spectre); Larry Lance (Earth-Two (Pre-Crisis)) (corpse, death in flashback); Sargon the Sorcerer [John Sargent] (Earth-Two (Pre-Crisis)) (revealed to have migrated to Earth-One in 1950); The Spectre [Jim Corrigan] (Earth-Two (Pre-Crisis)) (revealed to be trapped in the body of the Earth-One Jim Corrigan); Johnny Thunder (Earth-One, villain); Thunderbolt (Earth-Two (Pre-Crisis)) (under Earth-One Johnny Thunder's control, also in flashback); T-Dimension lifeforms
- Universe
- DC : mainstream
- Synopsis
- Earth-One's Johnny Thunder reveals the origin behind the second Canary, placed in limbo by Earth-Two's Johnny Thunder at the Earth-One Superman's request following their battle vs. Aquarius, since Aquarius's radiation was killing her as she crossed to Earth-One after her husband's death. She was then replaced by her daughter, whose memory had been replaced with her's. The heroes defeat the Earth-One Thunder alongside the Earth-Two counterpart, while the revived JLA aid their JSA allies on Earth-One. The current Canary has her original memory restored and leaves with Superman back to Earth-One.
- Reprints
- Keywords
- T-Dimension
JLA-JSA team-up conclusion. Origins of both Black Canaries this issue.
- Script
- Nicola Cuti
- Pencils
- Dick Dillin (logo illustration)
- Inks
- Dick Dillin (logo illustration)
- Colors
- ? (logo illustration)
- Letters
- typeset
- Job Number
- L-1426
Letters of comment from Brian Welch, Gary Young, and Wayne M. Studer.