'The Flash:' Top 10 moments from 'Duet,' musical crossover with 'Supergirl'

8. Moon river

Barry is taken to the musical world where he sees Kara singing. She is trying to be in her role, but it is clear she is confused once she sees Barry. They reunite and try to work out what is happening, even as they see their friends who they assume they know. However, they are different people and are part of a plot.

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