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The Serpent (At the power level where he tore Cap's shield apart)
Thing (Angir)
Hulk (Nul)
Juggernaut (Kuurth)
Titania (Skirn)_
Attuma (Nerkodd)
Grey Gargoyle (Mokk)
Sin (Skadi)
Absorbing Man (Greithoth)
Surtur
Loki
The Executioner
The Enchantress
Tanarus
Midgard Serpent

vs

Zeus, and all Olympians. Olympians have all their standard gods and artifacts. Classic Herc with mace is there as well.

Villains

Odin seemed to be pretty scared of The Serpent