World's Finest Vol. 1 (1941-1986) #198

Plot

The Guardians of the Universe summon Superman to stage a race with The Flash to offset the damage life-forms called Anachronids, who travel faster than the speed of light, have caused to the flow of time. When the duo encounter a group of Anachronids, they are thrown into another plane, but they return through a donut-shaped star, and resume their race.