his speed. The seventh season sees Barry continue to develop an artificial Speed Force and finish his fight with Eva before dealing with the emergence of several new Forces, the Strength, Still and Sage forces, that were born by Barry and Iris recreating the Speed Force. Trouble soon ensues when the manifestation of the new Speed Force goes mad and begins to threaten the city but Barry is able to tame it. Soon after, a new speedster calling himself Godspeed arrives from the future to threaten Barry but he is joined by his future children, Nora and Bart, to take the villain down. In season eight, Barry deals with the psychic alien Despero and the reemergence of Thawne, a malevolent entity named Deathstorm, who feeds on people's grief and the rise of the Negative Forces and their avatars, including Thawne. Crossovers In the season one episode "Worlds Finest" of Supergirl, Barry accidentally enters the universe of Kara Danvers / Supergirl and Clark Kent / Superman after passing through an extradimensional breach while testing a tachyon accelerator. He teams up with Kara in order to take down Livewire and Silver Banshee, after which Kara assists him in returning to his universe. In the crossover "Crisis on Earth-X", Barry and Iris' friends come to Central City for their wedding, only to be interrupted when villains from Earth-X disrupt the proceedings. After defeating the invaders from Earth-X, Barry and Iris are married by John Diggle. In the crossover "Elseworlds", Arkham Asylum doctor John Deegan rewrites reality, which results in Barry and Oliver swapping lives. In the new reality, they are the only ones that know that they are in the wrong lives and have each other's powers, which results in them going to Gotham City with Kara Danvers / Supergirl to confront Deegan. In the crossover "Crisis on Infinite Earths", the Monitor recruits Barry, Oliver, Kara, Kate Kane / Batwoman, Sara Lance / White Canary, Ray Palmer / Atom, and several others from throughout the multiverse to stop the Anti-Monitor from destroying reality. Barry's fate during the crisis is altered by the intervention of Earth-90's Flash, who sacrifices himself in Barry's place. Following Oliver's sacrifice and the Anti-Monitor's defeat, Barry leads a new group of heroes who agree to work together to protect their new world, dubbed Earth-Prime, in memory of Oliver. Costume Barry's suit is altered and upgraded every season. The suit