- Grant Gustin (Barry Allen / The Flash)
- Candice Patton (Iris West-Allen)
- Danielle Panabaker (Khione)
- Danielle Nicolet (Cecile Horton)
- Kayla Compton (Allegra Garcia)
- Brandon McKnight (Chester P. Runk)
- Jon Cor (Mark Blaine / Chillblaine)
The Flash — S0E42
Episode: The Flash: Hitting the Fast Note
Air Date: 2017-03-29
Runtime: 4 min
Overview
The meta-musical, from concept to final score. Season 3 featurette.