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

4. Versus Meister

Back in their reality, Cisco, John and Wally work together to get the Music Meister so they can get him to the lab. Eventually, Mon-El and Iris go to him to find out how to save Kara and Barry. The Meister refuses to talk but points out they can if they love them enough.

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