Fourth Dimension

The Fourth Dimension exists as an alternate and theoretical plane of reality. It is a confined reality within the abstract definitions of space/time, though it is possible in certain circumstances to pass from normal reality (the Third Dimension) into the Fourth Dimension. The Fourth Dimension represents the passage of time, and has been dubbed "The Timestream".

In DC Comics, the Fourth Dimension is routinely policed by a group called the Linear Men. They govern and monitor changes in the dimension and how it relates to the measuring of space and time in conjunction with other realities. Variances in these measurements results in what some have described as "Hypertime".