“Secret Origin of the Guardians!”
Hal Jordan and Alan Scott team up to fight the Guardians' oldest adversary... Krona.
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Green Lantern #40 (1960) is issue #40 of DC's Green Lantern (1960–1986), with a cover date of October 1965. Written by Henry Boltinoff and John Broome and drawn by Henry Boltinoff and Gil Kane.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.