Superboy in "The Pupils of the Past"
When Miss Shipley retires after 40 years of teaching in Smallville, Clark searches for the one student who left a rose for her on her desk. It turns out to be the school handyman, who proposes to her.
Aquaman in "The Treasure Beneath the Lake"
Green Arrow in "The Boy Detective"
Johnny Quick in "The Slowpoke Crimes!"
Johnny Quick battles crooks who foil his speed by operating in slow motion.