Check here for villains that fought in the Battle.
Killed by the death of Captain Atom:
The people of Coast City, California
(JLA) Green Lantern/Hal Jordan, Robin/Tim Drake, Nightwing, Batgirl, Steel, Aquaman, The Atom, Dr. Fate, Hawkman, Green Arrow, Elongated Man, Black Canary, Firestorm and Zatanna.
(Avengers)Spider-Man, Iron Man, Giant Man, the Wasp, the Hulk, Hawkeye, Wonder Man, Tigra, Sub-Mariner, She-Hulk, The Black Panther, Falcon, Mr. Fantastic, Invisible Woman, Human Torch, the Thing, the Whizzer, US Agent and Dr. Strange.
(Villains) Ultron, The Cyborg Superman, Livewire, Kryptonite Man, Bionicco, Kanjar Ro, Despero, Dr. Light, The Absorbing Man, Dr. Destiny, Ultra-Humanite, Dr. Doom, Klaw, Titania, Dr. Octopus, The Shaggy Man, Amazo(I), Kobra, H.I.V.E., The Key and Chronos
Killed by Visharon:
Red Tornado, Vision and Captain Atom
Note: Captain Atom's death causes nuclear explosion that destroyed Coast City, California and most of JLA and Avengers
Reason death didn’t occur:
Adam Kent/Superman- He’s Superman
Adam Kelly- In war vessel above Coast City
Superboy/Jack Kent- Superman’s son
Supergirl/Lauren Kent- Superman’s daughter
Superwoman/ Kara Kent- Superman’s close genetic relative
Bionic Man- In war vessel above Coast City
Batman/Bruce Wayne- Inside Visharon's hidden ship
The Flash/Barry Allen- Inside Visharon's hidden ship
Thor- god
Hercules- demi-god
Vandal Savage-immortal
Kang- Can't be killed
Loki- god
Visharon- Can't be killed
Parasite- Absorbed the nuclear energy into him
Metallo (II)- His body was destroyed but his head survived.
Note: Captain America was once a member of the Avengers but sacrificed his life to kill the Red Skull and stop the Nazis’ Dooms Day Device.