After seeing through a portal that the Oxygen Destroyer took out Godzilla, evil doers get their hands on some.
They drop on:
1. Aquaman's Atlantis (Arthur is home)
2. Namor's Atlatnis (Namor is home)
3. On R'lyeh (although they are evil, they don't like Cthulhu and he is home).
The weapon releases - who survives, the citizens, the major types (Arthur, Namor, Cthulhu)?