Secret Of The Sizzling Sparklers! One day while spending time in their Earth disguises of Carter and Shera Hall, Hawkman and Hawkgirl are surprised to find that communications devices are being transformed into strange devices. Soon there are reports of strange alien craft prompt the two to go into action in their costumed identities.
Battling the strange aliens, Hawkman and Hawkgirl are hard pressed finding a weakness against these invaders. During their fight, a arrow shot through some fireflies causes one of the aliens to weaken. However, before Hawkman can investigate further, Hawkgirl is struck by an alien beam and is then rushed back to the museum to recuperate and regroup.
Realizing the devices that were transported into the museum earlier were communications devices that work through telepathy, Hawkman tries to use one to communicate with it's mysterious sender. It turns out that it was sent by a woman of the dimensional world of Llorth, and that the invaders are called the Tralls. Apparently, the Tralls tyrannically rule over the people of Llorth and have come to Earth to bath in unique cosmic energy that is found on Earth so that they can restore their superior mental powers to continue to rule.
Hawkman deduces that the Luciferase and Adenosine Tri-Phosphate in fireflies (the chemicals that allow them to glow) are the weakness of the Tralls. The duo synthesize sparklers and a gas which uses the chemicals to turn back the Trall invaders, forcing them to return to their own dimension without their restored powers. Hawkman and Hawkgirl agree to keep the strange communication device should the people of Llorth ever need their help again.
