The Fifth Dimension is an inter-dimensional reality that exists outside of the normally accepted space/time continuum. Due to its five dimensional properties, this reality functions off of a completely different set of physics than those found in typical three dimensional environments.
Zrfff is the home world of a race of impish beings who manipulate the properties of their dimension as a form of "super-science".
The most recognizable denizen of the Fifth Dimension is the troublesome Mister Mxyzptlk. Another famous hero of Fifth Dimension origins is Yz, the Thunderbolt (New Earth). Yz, who was originally considered a magical genie, is most famous for his adventures with the Justice Society of America in the 1940's.
Points of Interest
- In Earth-One continuity, Mxypolis was a metropolitan city in the 5th Dimension. Mister Mxyzptlk or Bat-Mite patterned it after the city of Metropolis. 
- Zrfff: is a strange world in the Fifth Dimension, home of the creatures known on Earth as "imps" and "genies".
- List of 5th Dimension Inhabitants
- Mister Mxyzptlk
- Miss Gsptlsnz
- Mister Genie (Genro)
- Yz, the Thunderbolt