When QuickSilver and the other Avengers go to the DC Universe, he becomes interested in the Speed Force and becomes obsessed with defeating The Flash, but he fails twice. During the final battle in the Savage Land, he finally defeats Flash but only does so because there is no Speed Force in the Marvel Universe.(just kidding) He makes an appearance in the final battle with Krona, but it is very brief. He also appears at the end as one of the heroes that started out the entire event.
Quicksilver is a mutant capable of moving and thinking at superhuman speeds. Originally capable of running at the speed of sound; exposure to the High Evolutionary's Isotope E made it possible for the character to run at supersonic speeds of up to Mach 10 and able to think and move at extreme speeds. His entire body has adapted to the rigors of high-speed running, and his cardiovascular and respiratory systems are many times more efficient than those of a normal human being. His body can somehow resist the immense friction generated by high speed movement to a degree unmatched even by other Ultimate Marvel speedsters. Quicksilver has stated he can run at speeds up to Mach 10 even as a teenager. The longer he runs the more momentum he gains and the faster he becomes. He is so fast, that he was able to casually reach speeds near light.Edit
Wally is the fastest of all the Flashes, arguably even the fastest being that has ever existed and it has been remarked that Wally and Barry Allen are the only two speedsters that were fast enough to even outrun death. However, now that Barry Allen is back, his "Fastest Man Alive" title may be in dispute. Wally's speed has fluctuated from his career as Kid Flash, where he could run beyond the speed of light, to the beginning of his career as the Flash, in which he was limited to a top speed of approximately 700 mph (1,100 km/h). He is now confirmed to be able to run beyond the speed of light