Wally West, the third Flash, disappeared with his family (wife Linda and their twin newborn children) while assisting in containing Superboy Prime during INFINITE CRISIS.
Where did he go? He knew it wasn't the Speed Force. It's not death exactly. Where is Wally and family and when will we be hearing more from them?
Also, Barry Allen, Max Mercury, and Johnny Quick briefly emerged from the Speed Force and resumed corporeal form during INFINITE CRISIS. Are they truly not dead and capable of, under extraordinary resources, resuming their physical lives on Earth?
Buried Alien (The Fastest Post Alive!)