Watch The Flash Season 1 Episode 21 Full HD Online with SUB

While searching for Eddie and Eobard, Barry encounters a would-be thief in the gold hoard, before being disoriented by an unknown psychological attack. Back at S. T. A. R. Labs, Iris confronts Barry about being the Flash. He is able to stop the thief, who turns out to be Ailing, controlled by Grodd's mind. On a tip from Iris, Barry, Joe, and Cisco head to the sewers in search of Grodd. The trio realizes that Grodd is getting smarter and bigger, and during the attack, Joe is kidnapped by Grodd. Cisco and Caitlin build Barry a device that will prevent the Grodd effect. The device works, but is damaged in a fight. Barry is able to fend off Grodd's psychic attack and trick him into jumping in front of an oncoming train. Ayling is released. Iris reveals her feelings for Barry, but states her choice to be with Eddie. Grodd turns out to be alive and wanders the streets. Meanwhile, Thawne is working on a device that will allow him to return to his own time. He reveals Eddie, Iris, and Barry's marriage in the future. Later, Thawne completes work on the device and it is revealed that he is hiding in a secret chamber inside the S. T. A. R. Labs.