Superboy and Krypto are flying by Professor Potter's place where they see giant flowers break through the roof of his greenhouse. Landing, Superboy talks with Potter, who says he was testing a growth acceleration formula and is very happy with the results. Potter goes on to say that he thinks he has an antidote to kryptonite and gets Superboy to drink it. Potter exposes Superboy to kryptonite to prove the antidote but Superboy starts feeling ill right away and Potter puts the kryptonite away. Superboy and Krypto leave shortly thereafter.
At night, Clark Kent realizes he is growing out of control and leaves home to protect his secret identity. The next morning, an airliner in flight encounters the gigantic Superboy and nearly crashes only to be saved by Superboy's gigantic hand. Krypto is confused by the giant sized Superboy but goes with him as Superboy saves a deep sea diver and stops a giant tidal wave from killing people on shore.
Superboy goes to Potter's place where he learns Potter mixed the kryptonite cure with the plant cure formula but has an antidote for the formula. Superboy drinks the antidote but flies off to deal with damaged power cables before the antidote takes effect. Superboy does return to normal size and he and Krypto fix the damaged cables together.