The Leg-endary Realm of Mettaton-EX is a titanic, efficient nation, ruled by Mettaton with an iron fist, and remarkable for its museums and concert halls, deadly medical pandemics, and pith helmet sales. The hard-nosed, cynical, humorless, devout population of 11.023 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 Defense, Industry, and Education. It meets to discuss matters of state in the capital city of Mettatown. The average income tax rate is 74.2%.

The frighteningly efficient Mettatonian economy, worth a remarkable 5,971 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 541,733 Mettabucks, and evenly distributed, with the richest citizens earning only 3.7 times as much as the poorest.

The mouth-frothing MTT-Brand Citizen can be confused for a rabid Burgerpants, cutting-edge missile systems are being retrofitted to twin-prop air force biplanes, children high on sugar can often be seen bouncing off walls, and the government is plagued with uncertainty. 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 555^th in the world and 1^st in Homestuck for Fattest Citizens, with 76.73 Obesity Rate.