Witness the origin and first appearance of Supergirl in "The Supergirl from Krypton!" Kara Zor-El, Superman's long-lost cousin, arrives on Earth and adopts a secret identity to aid Superman in the ongoing fight for truth and justice!
First appearance of Metallo (M) and Supergirl (SG) March 31, 1959 - cover date May, 1959. M strikes me as an almost 'proto' Iron-Man (IM): chest plate needing to be charged with Uranium in order for him to stay alive. But enough of that - lets get to SG! Her impact on the DCU is beyond measure: her many contributions have often been overlooked because of her more famous cousin. Seeing her take down The Anti-Monitor (AM) and save Superman (SM) in Crisis on Infinite Earths #7 is an issue all comic fans should read; she goes head to head with (arguably) a Galactus (G) power level foe and pushes him back - buying time for everyone else to regroup and fight on. Glad to have finally read this book!
As almost always happens with stories of this era, the screenplay is so poor compared to the current ones to be almost laughable (and it should deserve one star). But this issue is memorable for two reasons: the first one is the first apparition of Metallo, one of the most famous villains of the Superverse; the second is also another first time apparition, and none other than the first Supergirl, Kara Zor-El, which will meet an untimely end in the world famous Crisis on Infinite Earths maxiseries. Both Metallo and Supergirl are so famous that this issue of Action Comics has a great importance, and should have five stars, hence the three stars in total.
*I am reading one Supergirl aka Kara Zor-El (Earth-One) story every day, starting with her introduction in May 1959 in Action Comics #252, until her final appearance in October 1985, in Crisis on Infinite Earths #7.
It is a bit hazy how Argo City's plastic-like atmosphere dome is affected by the meteor shower. Main cause of destruction is always referred to in other books as well, as the meteors drilling holes on the lead coverings on the ground and exposing the green kryptonite.