Most references to Earth-616 appear in Marvel UK titles, in Excalibur, or in Marvel reference texts such as the guide to Alternate Universes (2005). In addition, there are a number of other references to Earth-616:
- In Marvel 1602 #6 (March 2004), Uatu the Watcher refers to the universe as Earth-616.
- In Marvel Knights 4 #15 (April 2005), Earth-616 is mentioned.
- In Uncanny X-Men #462 (September 2005), an alteration in reality of Earth-616 causes trans-temporal devastation, and Saturnyne attempts to destroy that particular temporal continuity to “cauterize the wound”.
There has been at least one attempt within Marvel canon to change the designation of Earth-616. In the final story arc of X-Man (issues #71-74), writer Steven Grant began to refer to the planet as “Earth 611” due to the destruction of several other Earths (which were all apparently “higher on the list” of the multiverse than the Marvel Earth) by a godlike entity. This change, an allusion to the events of DC’s Crisis on Infinite Earths, was not adopted by other writers.
In a superhero themed episode of NCIS, an excused suspect states “Why on Earth 616 would I know?”