The Leg-endary Realm of Mettaton-EX is a titanic, orderly nation, ruled by Mettaton with an iron fist, and renowned for its deadly medical pandemics, state-planned economy, and pith helmet sales. The hard-nosed, cynical, humorless, devout population of 10.692 billion MTT-Brand Citizens are ruled by a mostly-benevolent dictator, who grants the populace the freedom to live their own lives but watches carefully for anyone to slip up.

The relatively small, corrupt, well-organized government juggles the competing demands of Industry, Defense, and Education. It meets to discuss matters of state in the capital city of Mettatown. Citizens pay a flat income tax of 70.5%.

The frighteningly efficient Mettatonian economy, worth a remarkable 5,609 trillion Mettabucks a year, is driven entirely by a combination of government and state-owned industry, with private enterprise illegal. However, for those in the know, there is an enormous, deeply entrenched, broadly diversified black market in Information Technology, Arms Manufacturing, Retail, and Book Publishing. The private sector mostly consists of enterprising ten-year-olds selling lemonade on the sidewalk, but the government is looking at stamping this out. Average income is a breathtaking 524,603 Mettabucks, with the richest citizens earning 6.4 times as much as the poorest.

All tribal children are set for life with guaranteed government jobs, citizens are encouraged to show displeasure with politicians by poking them with sharp metal sticks, the first sword of Mettaton-EX does not run, and Mettaton-EX isn't what it used to be. Crime is totally unknown. Mettaton-EX's national animal is the Burgerpants, which is also the nation's favorite main course, and its national religion is MTT-Brand Fandom.

Mettaton-EX is ranked 4,950^th in the world and 1^st in Homestuck for Most Advanced Defense Forces, scoring 13,735.75 on the Total War Preparedness Rating.