<Table> <Tr> <Th> No . overall </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> <Th> Prod . code </Th> <Th> U.S. viewers ( millions ) </Th> </Tr> <Tr> <Th> 70 </Th> <Td> </Td> <Td> `` The Flash Reborn '' </Td> <Td> Glen Winter </Td> <Td> Story by : Andrew Kreisberg Teleplay by : Todd Helbing & Eric Wallace </Td> <Td> October 10 , 2017 ( 2017 - 10 - 10 ) </Td> <Td> T27. 13401 </Td> <Td> 2.84 </Td> </Tr> <Tr> <Td colspan="8"> Iris has been aiding Team Flash in Central City for six months , but refusing to grieve Barry . A flying Samurai with superpowers appears in Central City , threatening to destroy the city if the real Flash does not face him . Cisco reveals he has formulated a way to bring back Barry without destabilizing the Speed Force , and tracks down Caitlin for help . Against Iris ' direction , Team Flash successfully returns Barry , who appears rambling random statements and continually writing symbols on walls . Wally engages the Samurai , but is defeated . Cisco deciphers Barry 's writings and finds an apparently meaningless sentence . In an attempt to recover Barry 's memories , Iris gives herself up to the Samurai . The plan works and Barry speeds away , rescuing Iris and defeating the Samurai , who is revealed to be a robot . Caitlin rejoins Team Flash , but is revealed to have been working for a mobster called Amunet at the bar , while also continuing to prevent the Killer Frost personality from emerging . The `` Samuroid '' is revealed to have been controlled by the Thinker , whose plan was to draw out the Flash for his next schemes . </Td> </Tr> <Tr> <Th> 71 </Th> <Td> </Td> <Td> `` Mixed Signals '' </Td> <Td> Alexandra La Roche </Td> <Td> Jonathan Butler & Gabriel Garza </Td> <Td> October 17 , 2017 ( 2017 - 10 - 17 ) </Td> <Td> T27. 13402 </Td> <Td> 2.54 </Td> </Tr> <Tr> <Td colspan="8"> When Barry , Joe , and Cisco report to a crime scene , they discover remnants of a mysterious code . Cisco presents Barry with a technologically advanced suit , intended to facilitate his activities . He tests it out , trying to save someone from a haywire car , caused by metahuman Ramsey Deacon . Gypsy arrives on Earth - 1 for a date with Cisco , who is forced to cancel it so as to focus on Deacon . Acting on a suggestion from Caitlin , Iris signs her and Barry up for couples therapy to sort out their relationship . Deacon kidnaps a witness , who was previously a member of a tech team who sold him out of his idea . Barry and Wally go to save him , but Deacon uses his abilities to send Barry 's suit haywire . On Iris 's instructions , Barry throws lightning at himself , shorting out his suit . He then incapacitates Deacon , who is locked up in the meta wing of Iron Heights , revealed to be part of the Thinker 's plan . Cisco finally goes out with Gypsy . Wondering how Deacon gained his powers being absent during the particle accelerator incident , Barry and Joe learn from Deacon that there are `` others '' . </Td> </Tr> <Tr> <Th> 72 </Th> <Td> </Td> <Td> `` Luck Be a Lady '' </Td> <Td> Armen V. Kevorkian </Td> <Td> Sam Chalsen & Judalina Neira </Td> <Td> October 24 , 2017 ( 2017 - 10 - 24 ) </Td> <Td> T27. 13403 </Td> <Td> 2.62 </Td> </Tr> <Tr> <Td colspan="8"> In flashbacks , the Thinker observes Becky Sharpe , a woman with seemingly unending bad luck , and determines that she will be easily manipulated . In the present , Becky robs a bank , and gets away when Barry slips on marbles . Harry arrives from Earth - 2 , and tells Wally that Jesse has decided to break up in order to focus on her vigilantism . Cisco deduces that Becky is a metahuman with the power of favorable luck while inducing misfortune to others . Barry realizes that the portal he used to escape the Speed Force exposed an entire busload of people , including Becky and Deacon , to transformative dark matter . Harry informs Cisco that Jesse has expelled him from her crime - fighting team due to his attitude . Becky 's powers expand out of control , reactivating the particle accelerator , which Harry deliberately allows , nullifying Becky 's powers and leading to her incarceration . Cisco and Harry identify
when does the flash season 4 episode 3 air
October 24 , 2017