This is a great episode. Superman and The Flash meet for a race to determine who is the fastest man alive. As they race the Weather Wizard takes advantage of this. This is taken from the classic DC 1967 issue, Superman's Race With The Flash. You'll notice the differences between Flash and Superman in this episode. Flash has a large ego and loves to show how fast he is as when he first shows up at the race and runs around Superman in a blur. Superman stops him by putting out his arm. Superman likes to sight see as they run, such as watching whales breach as he and Flash race over the ocean but Flash is intent on the race. Superman and Flash clean up an oil spill after a tanker is damaged in a storm. Flash, with his ego, wants the crew members to know he helped clean up the spill. When he and Superman are frozen solid in an ice storm created by Weather Wizard, Superman uses his heat vision to get out of the ice. When he does he sees Flash already out of his ice prison, smiling at him. Flash had vibrated through the ice and is pleased to let Superman know this.
One difference I noticed in the episode is that Superman can run over water as Flash does. But in the DC story only Flash could do that and Superman had to swim. I highly recommend this episode.