Dimensional Transport (Omniverse) – The ability to travel from one comic book universe to another comic book universe specifically. A lot of characters can travel between alternate Earths in the Multiverse within the DC or Marvel universe using anything from super speed such as the Flash (DC) to technology, Dr. Doom (Marvel). In Unlimited Access #1, Access (DC, Marvel) has the very special power of being able to travel from the DC to the Marvel Multiverse and vice-versa and this is a rather unique type of dimensional transport and allows for cross-over comics! There has been discussion that a universe that includes both the DC and Marvel universes should be labeled an Omniverse.
A Guardian of the Universe figures out how to travel from the Star Trek universe to the DC universe in Star Trek Green Lantern: The Spectrum Wars #1 (2015).
The Cybermen have figured out how to travel from the Doctor Who universe to the Star Trek universe in Star Trek TNG Doctor Who – Assimilation2.
In Lockjaw #4, Lockjaw (Marvel) manages to visit the DC universe but is informed by Superman and Wonder Woman that their dimension is private property!