Superboy in Superboy's Most Amazing Dream"
Clark has dream in which as an adult he reveals his secret identity as Superman to Lana Lang. However Lois Lane is a Daily Planet reporter and she overhears Lana referring to Clark as Superman and exposes his secret to the world. Upon waking, Clark decides not to tell Lana his secret.
Aquaman in "The Mystery of the Seven Sea Statues"
Green Arrow in "The Undersea Archers"