The Speed Force was an energy field that granted all speedsters their power. Several speedsters have merged with it, including Barry Allen, Johnny Quick, and Max Mercury. Scientists on the planet Savoth had a deep understanding of the Speed Force and there were many universities devoted to its study. One of these scientists, Gorflack, built a Speed Force cannon to defend his planet from a force of alien invaders. Instead of performing its intended purpose, it brought Jay Garrick, the first Flash, to Savoth. After Garrick helped drive away the invaders, Gorflack gave him a a lightning-shaped piece of solidified Speed Force which he and his successors could use to transport to Savoth.
While fighting Superboy-Prime, Wally was nearly swept into the Speed Force. Wanting to see his family one last time, he visited his wife Linda and twin children. However, Linda was holding the Speed Force fragment and the entire family was swept off to Savoth. Bart Allen volunteered to absorb the entire Speed Force so that he would be fast enough to stop Prime. After this crisis had been averted, Bart found that his new connection to the Speed Force threatened to kill him. He refused to use his powers for a year. It wasn't until Tina McGee and Valerie Perez of S.T.A.R. Labs were able to modify a Flash costume to contain his abilities that he was able to return to action as the fourth Flash.
Shortly thereafter, Inertia, who had lost his connection to the Speed Force when Bart absorbed it and was forced to use Velocity 9 to maintain his super-speed, built a machine in Los Angeles which was designed to transfer it from Bart to himself. However, the machine also threatened to cause an explosion which would have resulted in the deaths of millions. Bart sacrificed himself distracting Inertia and a group of Rogues while Valerie shut it down. The deactivation of the machine caused a disruption in the Speed Force which not only resulted in Wally West and his family being transported back to Earth from their stay on Savoth, but also restored powers to all speedsters.
The sole survivor of the alien invasion forces that had attacked Savoth decades prior was sent back to his home dimension in a Speed Force explosion which resulted in a rapid evolution of his species. His descendants targeted the Flashes' solidified fragment of Speed Force and invaded Keystone City to avenge their defeat on Savoth. Wally destroyed the fragment to send them back.
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