- Script
- Gardner Fox
- Pencils
- Carmine Infantino
- Inks
- Joe Giella
- Colors
- ?
- Letters
- Gaspar Saladino
- Genre
- superhero
- Characters
- Flash [Barry Allen]; Flash [Jay Garrick]; Joan Garrick; Iris West; Captain Cold [Leonard Snart]; The Trickster [James Jesse]; Justice Society of America [Wonder Woman; The Atom [Al Pratt]; Hawkman [Carter Hall]; Green Lantern [Alan Scott]; Dr. Mid-Nite [Charles McNider]; Black Canary [Dinah Drake]] (all in flashback); The Key [Earth-2 villain] (flashback)
- Synopsis
- A comet crashes into Earth-2, emitting dangerous radiation that threatens life on the planet. Jay Garrick travels to Earth-1 looking for an idea to save his home world, arriving just in time to help Barry Allen fight two of his enemies. Jay continues on his way to get the information he needs, and the two Flashes exploit his search to lure the criminals out of hiding and back to prison.
- Reprints
- in The Flash (DC, 1959 series) #178 (April-May 1968) [minus 2 pages]
- in Lynet (Serieforlaget / Se-Bladene / Stabenfeldt, 1967 series) #12/1968 ([desember] 1968) [2 pages removed]
- in Eclipso (Arédit-Artima, 1968 series) #5 (avril 1969) [N&B [B&W]]
- in Crisis on Multiple Earths: The Team-Ups (DC, 2005 series) #1 (2005 [February 2006])
- in The Flash Archives (DC, 1996 series) #4 ([June] 2006)
- in Showcase Presents: The Flash (DC, 2007 series) #2 ([August] 2008)
- in DC Comics Classics Library: The Flash of Two Worlds (DC, 2009 series) ([October] 2009)
- in The Flash Omnibus (DC, 2014 series) #1 ([November] 2014)
- in The Flash: The Silver Age (DC, 2016 series) #2 ([November] 2017)
- in The Flash: The Silver Age Omnibus (DC, 2017 series) #1 (2018 [February 2019])
- in The Flash of Two Worlds Deluxe Edition (DC, 2020 series) ([April] 2020)
- Keywords
- comets; Earth-2
Story in four chapters: unnumbered chapter 1 (7 pages), Chapter 2 (7 pages), Chapter 3 (6 pages), Chapter 4 (4.67 pages).
- Script
- Jack Schiff
- Pencils
- Sheldon Moldoff
- Inks
- Sheldon Moldoff
- Colors
- ?
- Letters
- Ira Schnapp
- Genre
- advocacy
- Synopsis
- Frank takes his friends to the public library where they are impressed with the different kinds of books that can teach them new things.
Published in cooperation with the National Social Welfare Assembly.
On the page immediately following page 7 of the main story sequence.
- Script
- Julius Schwartz
- Pencils
- ?
- Inks
- ?
- Colors
- ?
- Letters
- ?
- First Line of Dialogue or Text
- In the vicinity of the Sun...
- Genre
- non-fiction; math & science
- Reprints
On the page immediately preceding page 15 of the main story sequence.
- Script
- Julius Schwartz
- Pencils
- Carmine Infantino (logo illustration)
- Inks
- ? (logo illustration)
- Colors
- ? (logo illustration)
- Letters
- typeset
Letters from Bill Warren, Randy Jones, Jack Santino, Jr., Bernie Bubnis, Jr., Bobby Kesner, Siegfried Rutschman, and Donald McGregor.
On the two pages between page 20 and page 21 of the main story sequence.