THE FLASH - SEASON FOUR
CRISIS ON EARTH-X,
PART 3
EPISODE NUMBER - 408
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CRISIS ON EARTH-X,
PART 3
EPISODE NUMBER - 408
Supergirl finds herself captive of the invaders from a dark, parallel Earth, who wish to take her heart to save the life of one of their own. Meanwhile Oliver, Barry, and Earth's other heroes must escape a Nazi camp on Earth-X -- with help from that planet's own heroes Ray and Citizen Cold.
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