Dimensional Travelers

A dimensional traveler is any character who can (more or less) freely travel between various planes of existence, like parallel universes, etc. Their ability to travel is usually powered by an Interdimensional Travel Device or some form of Functional Magic, but it can also happen that a character was inherently born with such power.

This is also a common explanation for Crossovers, as occasionally the characters will arrive in the universe of another hero.

A possible practical application of this power is to make use of Extradimensional Shortcuts.

Distinct from Time Travel because, although Time is considered the "fourth dimension", time travelers otherwise remain in the same plane while hopping between its different time periods.