Overnight ratings report for the Supergirl episode "Crisis on Earth-X"
Supergirl kicks off the DC TV crossover "Crisis on Earth-X" tonight.
Supergirl's Melissa Benoist talks about this year's DC TV crossover "Crisis on Earth-X."
Supergirl cast member Chyler Leigh previews the four-show DC TV crossover "Crisis on Earth-X" airing on The CW.
Greatest American Hero William Katt appears in the Supergirl chapter of the DC TV "Crisis on Earth-X" crossover.
30-second preview trailer for the DC TV crossover "Crisis on Earth-X"
Preview images for the Supergirl chapter of the DC TV crossover "Crisis on Earth-X, Part 1"
