Iris and Nia fall into a fever dream and explore different possibilities for their lives; Barry, Chester, Allegra and Cecile desperately try to help them; Khione feels that Mark is trying to make her something she is not.
Stars: Grant Gustin, Candice Patton, Danielle Panabaker
Director(s): Jesse Warn
Writer(s): Greg Berlanti, Andrew Kreisberg, Geoff Johns