Comic Title: Justice League of America #26
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: March 1964
On Sale Date: January 30, 1964 Newsstand Date January 30, 1964
Source: House Ad, Flash #143, Page 20

Copyright Date January 30, 1964
Source: Library of Congress, Periodicals 1964

Newsstand Date January 30, 1964
Source: Newsdealer Magazine, V19 #1

Frequency: Monthly, with the exception of Jan., April, July and Oct.
Cover Price: $0.12
Page Count: 32
Editor: Julius Schwartz

Title: "Four Worlds to Conquer"
Pages: 25

Feature(s):
Justice League of America (of Earth-1)

Writer: Gardner F. Fox
Penciller: Mike Sekowsky
Inker: Bernard Sachs

Reprinted In:
Justice League of America Archives Vol. 4 HC (1998)
Showcase Presents:Justice League of America Vol. 2 TPB (2007)
Justice League of America Omnibus Vol. 1 HC (2014)
Justice League of America:The Silver Age Vol. 3 TPB (2017)

Feature Character(s)

• Justice League of America (last appearance in Justice League of America #25; next appearance in Justice League of America #27)
• Batman (last appearance in Detective Comics #325; next appearance in World's Finest Comics #140)
• Flash (last appearance in Flash #143; next appearance in Brave and the Bold #53)
• Wonder Woman (last appearance in Wonder Woman #144; next appearance in Wonder Woman #145)
• Green Lantern (last appearance in Flash #143; next appearance in Green Lantern #28)
• Martian Manhunter (last appearance in Detective Comics #325; next appearance in Detective Comics #326)
• Aquaman (last appearance in Aquaman #14; next appearance in Aquaman #15)
• Green Arrow (last appearance in World's Finest Comics #138; next appearance in World's Finest Comics #140)
• Atom (last appearance in Atom #11; next appearance in Atom #12)

Supporting Character(s)

• Snapper Carr (last appearance in Justice League of America #23; next appearance in Justice League of America #27)

Villain(s)

• Despero (last appearance in Justice League of America #1; next appearance in Justice League of America #133)

Other Character(s)

• Midge (last appearance in Justice League of America #18; next appearance in Justice League of America #65)
• Inhabitants of R-Earth (reptiles, including a dinosaur-Flash; no further appearances)
• Inhabitants of I-Earth (intelligent insects, including a butterfly-Green Lantern and a butterfly-Batman; no further appearances)
• Inhabitants of M-Earth (intelligent sea life, including a shark-J'onn J'onzz and a shark-Aquaman; no further appearances)

Synopsis:
Despero fakes his own death and escapes the dimension of Kalanor, returning to Earth to plague the Justice League. He causes Snapper Carr, Wonder Woman, Green Arrow, and Atom to suffer from old age, and traps Batman, J'onn J'onzz, Flash, Aquaman, and Green Lantern in giant hourglasses formed from the energy of their own powers.

The hourglasses transport the heroes to chronal dimensions where Despero has formed three alternate Earths, which he intends to conquer. In these worlds, the JLA members are powerless, but are able to gift other inhabitants with their powers simply by touching them. Flash teams up with a super-fast dinosaur to halt an ice-age on R-Earth, where reptiles are the highest form of life, while Batman and Green Lantern find themselves on I-Earth, where they enable intelligent insects to harness the power ring's energy against the invasion, and Aquaman and J'onn J'onzz gift a race of parakinetic sharks with their super-powers on M-Earth.

Back in the Secret Sanctuary, an elderly "Superman" arrives late, only to be exposed by Wonder Woman as Despero in disguise. Caught in her magic lasso, the mutant villain is forced to return the other five members from the chronal dimensions and to restore the artificially aged members' youth.