answers: four
context: of Time, in an attempt to make the heroes destroy a computer which is about to stop time. He created it and gave the order, before realizing it would destroy the Universe as time would not be able to be restarted. He discovered it could not reject orders. The teams are defeated in the first battle, but follow a trace to 3786. The five beings have been defeated by the computer defenses, as it can summon beings from different times. The Elongated Man is able to slip through the defenses and break the computer just a few seconds before the </s> from her transformation into an OMAC. When Solomon sends the Challengers to a recreated Earth-51, Val dies and releases the Morticoccus virus, which infects the entire world. Meanwhile, the Brother Eye of Earth-51 transforms Professor Blank into a modified OMAC with limited free will, enabling him and his grandson Tommy to escape the ruins of Command-D, effectively birthing a new version of Earth A.D. from the original Kamandi series. The Rogues are reconstituted with a new membership of Heat Wave, Mirror Master, Captain Cold, Abra Kadabra, Weather Wizard, Trickster and Pied Piper, led by Inertia. Several Rogues distrust Trickster and </s> beginning at the end of "Supergirl". Planning for the crossover began in December 2016, with "Arrow" showrunner Wendy Mericle saying, "We actually sort of do, believe it or not, have a concept for what we want to do for next year's crossover. It's crazy." By February 2017, planning began for a true four-way series crossover. Because each series was renewed for an additional season, the producers could plan production schedules to incorporate the crossover. Executive producer Andrew Kreisberg said, "One of the big things we learned from ["Heroes Join Forces"], which made ["Invasion!"] slightly easier, was building in shut-down days,
question: how many episodes are in crisis on earth x