phantom zone was the episode of supergirl that was crisis on earth x.
which episode of supergirl is crisis on earth x?
phantom zone
the episode ends with a scene setting up the crossover event "invasion!" that begins on "the flash" season 3 episode 8, continues on "arrow" season 5 episode 8 and concludes on "legends of tomorrow" season 2 episode 7. this scene is later repeated in the "flash" episode of the crossover. kara/supergirl appears in all three episodes as a visitor to their universe due to "supergirl" being set in a different earth, referred to as earth-38 by the inhabitants of the arrowverse, and has been informally referred to as "earth-cbs" by "arrow" showrunner marc guggenheim, named for the network where "supergirl" first aired.
medusa (supergirl)
earth x





























earth x is a 1999 comic book limited series published by marvel comics. "earth x" was written by jim krueger with art by john paul leon. based on alex ross' notes, the series features a dystopian version of the marvel universe.





























the series was followed by two sequels, universe x and paradise x. the universe of "earth x" is designated as earth-9997.





























section::::history.
earth x