Iris killed by Savitar, he becomes desperate to change the future to prevent that from happening. He learns the identity of Savitar is a clone of a future version of himself. After saving Iris and defeating Savitar, Barry takes his place in the Speed Force in order to repent for his creation of Flashpoint. In season four, after being stranded in the Speed Force for six months, Barry is freed by Team Flash. The team later encounters Clifford DeVoe / Thinker, an adversary with the fastest mind alive, who has orchestrated Barry's return from the Speed Force as well as the creation of the bus metas. However, DeVoe frames Barry for murder shortly afterwards; not wanting to risk compromising his loved ones and allies by revealing his secrets, Barry allows himself to be sentenced to life imprisonment. A month later, private detective Ralph Dibny, who joins the Flash's team, uses his new shapeshifting power to impersonate DeVoe and help clear Barry of all charges. Following the Thinker's defeat, the team is approached by Barry and Iris' daughter from the future, Nora West-Allen. In season five, Nora arrives from the future, wanting to change the events that lead to Barry's disappearance in the future. However, Nora's presence has altered the timeline and unleashed Cicada, a serial killer bent on killing metahumans. Furthermore, the team eventually learn of her allegiance with Eobard, who orchestrated Nora's arrival and Cicada. Barry and Nora succeed in subduing Eobard, but are forced to let him go and Nora is erased from the timeline. In season six, Barry and Iris learn that the date of the crisis in which Barry disappears has moved up from April 2024 to December 2019, and that in order to save billions, the Flash must die. Meanwhile, Ramsey Rosso has discovered a way to cure people through dark matter, only to turn himself into a metahuman with a violent bloodthirst. Following Rosso's defeat, Barry surviving the crisis, and the multiverse's destruction and rebirth, Team Flash try to navigate the world post-crisis all while the secret organization Black Hole and quantum engineer Eva McCulloch move forward with their mysterious plans. Barry later discovers that Oliver enhancing his speed during the crisis has damaged the Speed Force. As a result, the Speed Force dies and all speedsters will permanently lose their speed. Barry gets the idea to create an artificial Speed Force to save