<Tr> <Td> 21 </Td> <Td> "Grodd Lives" </Td> <Td> May 5, 2015 </Td> <Td> 1.5 / 5 </Td> <Td> 3.62 </Td> <Td> 0.9 </Td> <Td> 2.27 </Td> <Td> 2.4 </Td> <Td> 5.97 </Td> </Tr> <Tr> <Td> 22 </Td> <Td> "Rogue Air" </Td> <Td> May 12, 2015 </Td> <Td> 1.5 / 5 </Td> <Td> 3.65 </Td> <Td> 0.9 </Td> <Td> N / A </Td> <Td> 2.4 </Td> <Td> N / A </Td> </Tr> <Tr> <Td> 23 </Td> <Td> "Fast Enough" </Td> <Td> May 19, 2015 </Td> <Td> 1.5 / 5 </Td> <Td> 3.87 </Td> <Td> 1.0 </Td> <Td> 2.38 </Td> <Td> 2.5 </Td> <Td> 6.25 </Td> </Tr> <Table> <Tr> <Th> No . </Th> <Th> Title </Th> <Th> Air date </Th> <Th> Rating / share (18--49) </Th> <Th> Viewers (millions) </Th> <Th> DVR (18--49) </Th> <Th> DVR viewers (millions) </Th> <Th> Total (18--49) </Th> <Th> Total viewers (millions) </Th> </Tr> <Tr> <Td> </Td> <Td> "The Man Who Saved Central City" </Td> <Td> October 6, 2015 </Td> <Td> 1.4 / 5 </Td> <Td> 3.58 </Td> <Td> 1.0 </Td> <Td> 2.35 </Td> <Td> 2.4 </Td> <Td> 5.93 </Td> </Tr> <Tr> <Td> </Td> <Td> "Flash of Two Worlds" </Td> <Td> October 13, 2015 </Td> <Td> 1.4 / 4 </Td> <Td> 3.49 </Td> <Td> 0.8 </Td> <Td> 2.06 </Td> <Td> 2.2 </Td> <Td> 5.52 </Td> </Tr> <Tr> <Td> </Td> <Td> "Family of Rogues" </Td> <Td> October 20, 2015 </Td> <Td> 1.4 / 5 </Td> <Td> 3.47 </Td> <Td> 0.9 </Td> <Td> 2.05 </Td> <Td> 2.3 </Td> <Td> 5.60 </Td> </Tr> <Tr> <Td> </Td> <Td> "The Fury of Firestorm" </Td> <Td> October 27, 2015 </Td> <Td> 1.4 / 4 </Td> <Td> 3.43 </Td> <Td> 0.9 </Td> <Td> 2.04 </Td> <Td> 2.3 </Td> <Td> 5.46 </Td> </Tr> <Tr> <Td> 5 </Td> <Td> "The Darkness and the Light" </Td> <Td> November 3, 2015 </Td> <Td> 1.5 / 5 </Td> <Td> 3.87 </Td> <Td> 0.8 </Td> <Td> 1.68 </Td> <Td> 2.3 </Td> <Td> 5.55 </Td> </Tr> <Tr> <Td> 6 </Td> <Td> "Enter Zoom" </Td> <Td> November 10, 2015 </Td> <Td> 1.5 / 5 </Td> <Td> 3.63 </Td> <Td> 0.9 </Td> <Td> 2.05 </Td> <Td> 2.4 </Td> <Td> 5.68 </Td> </Tr> <Tr> <Td> 7 </Td> <Td> "Gorilla Warfare" </Td> <Td> November 17, 2015 </Td> <Td> 1.4 / 4 </Td> <Td> 3.46 </Td> <Td> 0.8 </Td> <Td> 1.92 </Td> <Td> 2.2 </Td> <Td> 5.38 </Td> </Tr> <Tr> <Td> 8 </Td> <Td> "Legends of Today" </Td> <Td> December 1, 2015 </Td> <Td> 1.4 / 5 </Td> <Td> 3.94 </Td> <Td> 0.9 </Td> <Td> 2.12 </Td> <Td> 2.3 </Td> <Td> 6.07 </Td> </Tr> <Tr> <Td> 9 </Td> <Td> "Running to Stand Still" </Td> <Td> December 8, 2015 </Td> <Td> 1.3 / 4 </Td> <Td> 3.55 </Td> <Td> 0.9 </Td> <Td> 2.01 </Td> <Td> 2.2 </Td> <Td> 5.56 </Td> </Tr> <Tr> <Td> 10 </Td> <Td> "Potential Energy" </Td> <Td> January 19, 2016 </Td> <Td> 1.3 / 4 </Td> <Td> 3.41 </Td> <Td> 1.0 </Td> <Td> 2.06 </Td> <Td> 2.3 </Td> <Td> 5.48 </Td> </Tr> <Tr> <Td> 11 </Td> <Td> "The Reverse - Flash Returns" </Td> <Td> January 26, 2016 </Td> <Td> 1.4 / 5 </Td> <Td> 3.71 </Td> <Td> 1.0 </Td> <Td> 2.02 </Td> <Td> 2.4 </Td> <Td> 5.73 </Td> </Tr> <Tr> <Td> 12 </Td> <Td> "Fast Lane" </Td> <Td> February 2, 2016 </Td> <Td> 1.4 / 5 </Td> <Td> 3.66 </Td> <Td> 0.8 </Td> <Td> 1.86 </Td> <Td> 2.2 </Td> <Td> 5.53 </Td> </Tr> <Tr> <Td> 13 </Td> <Td> "Welcome to Earth - 2" </Td> <Td> February 9, 2016 </Td> <Td> 1.6 / 5 </Td> <Td> 3.96 </Td> <Td> 0.9 </Td> <Td> 2.02 </Td> <Td> 2.5 </Td> <Td> 5.98 </Td> </Tr> <Tr> <Td> 14 </Td> <Td> "Escape from Earth - 2" </Td> <Td> February 16, 2016 </Td> <Td> 1.5 / 5 </Td> <Td> 3.90 </Td> <Td> 0.8 </Td> <Td> 1.77 </Td> <Td> 2.3 </Td> <Td> 5.67 </Td> </Tr> <Tr> <Td> 15 </Td> <Td> "King Shark" </Td> <Td> February 23, 2016 </Td> <Td> 1.4 / 5 </Td> <Td> 3.80 </Td> <Td> 0.9 </Td> <Td> 1.96 </Td> <Td> 2.3 </Td> <Td> 5.77 </Td> </Tr> <Tr> <Td> 16 </Td> <Td> "Trajectory" </Td> <Td> March 22, 2016 </Td> <Td> 1.1 / 4 </Td> <Td> 3.00 </Td> <Td> 0.9 </Td> <Td> 1.96 </Td> <Td> 2.0 </Td> <Td> 4.96 </Td> </Tr> <Tr> <Td> 17 </Td> <Td> "Flash Back" </Td> <Td> March 29, 2016 </Td> <Td> 1.3 / 5 </Td> <Td> 3.39 </Td> <Td> 0.9 </Td> <Td> 1.92 </Td> <Td> 2.2 </Td> <Td> 5.31 </Td> </Tr> <Tr> <Td> 18 </Td> <Td> "Versus Zoom" </Td> <Td> April 19, 2016 </Td> <Td> 1.2 / 4 </Td> <Td> 3.03 </Td> <Td> 0.8 </Td> <Td> 2.03 </Td> <Td> 2.0 </Td> <Td> 5.07 </Td> </Tr> <Tr> <Td> 19 </Td> <Td> "Back to Normal" </Td> <Td> April 26, 2016 </Td> <Td> 1.3 / 5 </Td> <Td> 3.39 </Td> <Td> 0.8 </Td> <Td> 1.86 </Td> <Td> 2.1 </Td> <Td> 5.26 </Td> </Tr> <Tr> <Td> 20 </Td> <Td> "Rupture" </Td> <Td> May 3, 2016 </Td> <Td> 1.3 / 5 </Td> <Td> 3.34 </Td> <Td> 0.8 </Td> <Td> 1.92 </Td> <Td> 2.1 </Td> <Td> 5.25 </Td> </Tr> <Tr> <Td> 21 </Td> <Td> "The Runaway Dinosaur" </Td> <Td> May 10, 2016 </Td> <Td> 1.3 / 5 </Td> <Td> 3.52 </Td> <Td> 0.8 </Td> <Td> 1.82 </Td> <Td> 2.1 </Td> <Td> 5.34 </Td> </Tr> <Tr> <Td> 22 </Td> <Td> "Invincible" </Td> <Td> May 17, 2016 </Td> <Td> 1.3 / 5 </Td> <Td> 3.37 </Td> <Td> 0.9 </Td> <Td> 2.08 </Td> <Td> 2.2 </Td> <Td> 5.45 </Td> </Tr> <Tr> <Td> 23 </Td> <Td> "The Race of His Life" </Td> <Td> May 24, 2016 </Td> <Td> 1.3 / 5 </Td> <Td> 3.35 </Td> <Td> 0.6 </Td> <Td> 1.49 </Td> <Td> 1.9 </Td> <Td> 4.85 </Td> </Tr> </Table>

When does season 6 of the flash start