With the dawn of what fans and historians call the Silver Age of Comic Books, Broome was instrumental in writing stories of two key characters who helped revive the moribund archetype of the superhero. Following the creation of an all new Flash, a.k.a. Barry Allen, who carried the superhero name from the original Golden Age Flash, by scripter Robert Kanigher and penciler Infantino in "Showcase" #4 (Oct 1956)—considered the comic that triggered the Silver Age—Broome wrote Flash stories beginning in that very issue. He wrote numerous Flash stories in the character's subsequent series. He co-created several of the character's primary supervillain antagonists including Captain Boomerang in issue #117 (Dec. 1960), the 64th century villain Abra Kadabra in #128 (May 1962), and Professor Zoom in #139 (Sept. 1963). Captain Boomerang was featured in the 2016 "Suicide Squad" film and was portrayed by actor Jai Courtney. Other Broome additions to the Flash mythos, Kid Flash and the Elongated Man were respectively introduced in issues #110 and 112 as allies of the speedster.