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

7. A little love

The Music Meister tells Barry and Kara that in order to leave the musical world, they need to follow the script. After a musical number, Kara and Barry are taken hostage by two thugs who look like Joe and Professor Stein. The two men want them to find “Millie,” who is their Iris and has gone missing.

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