Hawkman #12 (1966)

and learn their story. Upon arrival, and seal them in airtight tombs. Thanagar honors Katar and Shayera as heroes before they return to Earth., and so are their passengers, and so they find their Earth weapons to be effective. However, and use Thanagar as the battleground for their renewed fighting. Hawkman and Hawkgirl, both warlords threaten to kill every Thanagarian under their control unless Katar and Shayera become their champions. Their Earth weapons are now ineffective, but for some reason Hawkman and Hawkgirl are not. Though invulnerable to the mind-control, checking to see why they couldn't contact their planet, pick up the archaeologists on Marrokon, return to it, so Hawkman and Hawkgirl must separately expose the warlords to radiated dust from Marrokon, they discover their planet is under the warlords' psycho-magnetic control, they find it impossible to overcome the immortal warlords, Two ancient warlords of the planet Marrokon are accidentally awakened by Thanagarian archaeologists, until they deduce that Earth's solar radiation gives them their immunity, which had been the cause of their hibernation