Adventure Comics (1938) 334-A

Tales of the Legion of Super-Heroes in "The Unknown Legionnaire!"
The Legion reminisce about the case where they where helped by a hero named Unknown Boy. it was reveled that Unknown Boy was actually Supergirl, suffering from amnesia brought on be Red Kryptonite.

Superboy in "The One-Man Baseball Team!"
reprinted from Superboy (Vol 1) #57.
Superboy plays a game of baseball, playing every position on the team.