Inside front cover.
Original version shows Clark watching TV. In the 80-Page Giant reprint, Clark receives pictures from the future on the radio.
Story retold from the Superman newspaper strip: episode 103 -- "The Impostor from the Year 3004."
DC credited the script to Bill Finger in The Green Arrow by Jack Kirby and The Jack Kirby Omnibus #1 reprints, but they credit Dave Wood in the Showcase Presents Green Arrow #1 reprint. The GCD writing-experts' consensus is that Wood is the most-likely candidate, but Herron is possible, and Finger is also possible, but the least-likely of the three.
Writer credit from Martin O'Hearn at http://martinohearn.blogspot.com/ .