The Mercury Monster was an invading Appellaxian.
- Unique Physiology:
- Self-Sustenance: The monster can survive without air. 
- Density Control: A living mercury pool, able to engulf enemies and reform itself if split. 
- Molecular Reconstruction: He could turn other living beings into mercury beings.
- Psychic Link: The monster can't talk, but can telepathically transmit its thoughts. 
- Even without eyes, the creature can feel what happens in its surroundings, by unknown ways.
- Power Limitation: It could only control humans and animals transmuted into mercury beings, and his Molecular Reconstruction effects will fade if it is made unconscious.
- Vulnerability to Heat: 
- Appellaxian Meteor: A small ship disguised as a crystalline meteor. The meteor had the abilities: Flight (FTL speed), Bio-Fission (it could create a copy from the passenger, keeping intact its memories and abilities), Mind Control, Size Alteration (to shrink the passenger) and Self-Sustenance.
- 14 Appearances of Mercury Monster (New Earth)
- 1 Images featuring Mercury Monster (New Earth)
- Quotations by or about Mercury Monster (New Earth)
- Character Gallery: Mercury Monster (New Earth)
This character is or was primarily an enemy of the Justice League, in any of its various incarnations. This template will categorize articles that include it into the category "Justice League Villains."