Broome, with penciler Kane and editor-conceptualist Schwartz, created Hal Jordan, the Silver Age Green Lantern, in "Showcase" #22 (Oct. 1959). He became the character's primary scripter in Green Lantern's solo series as well. Broome's stories for the "Green Lantern" series included transforming Hal Jordan's love interest, Carol Ferris, into the Star Sapphire in issue #16. Black Hand, a character featured prominently in the "Blackest Night" storyline in 2009–2010, debuted in issue #29 (June 1964) by Broome and Kane. The creative team created Guy Gardner in the story "Earth's Other Green Lantern!" in issue #59 (March 1968). Writer-editor Dennis Mallonee described Broome's work on "Green Lantern" as the only superhero series in which screwball comedy "was essentially realized", and called Broome "a genius. He wrote about Hal Jordan, not Green Lantern. Hal's total frustration with Carol's completely goofy 'independence' was the reason I got a kick out of the early silver age Green Lantern." Comics historian Brian Cronin examined similar themes in Broome's work in a 2011 column.