“Mystery of the Star Sapphire, Part 3”
Hal frees Cowgirl from the Star Sapphire's power.
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Green Lantern #20 (2005) is issue #20 of DC's Green Lantern (2005–2011), with a cover date of July 2007. Written by Geoff Johns and drawn by Daniel Acuña and Dave Gibbons.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.