So, I was just looking through synopses of issues of Superboy, and noticed this issue which contains a story called "Superboy's Big Brother!", in which the Kents adopt a youth named Robert!

I wonder if there's any relevance to everyone's favorite "big brother" of Superboy, ol' Bob Cobb himself?

Also of interest:

This issue features Superboy traveling to the 30th century to star in a movie!

The Golden Age Mon-El! By "Superboy's costume", they just mean Clark's clothes!

Surely this youth is placed in the Phantom Zone, then re-emerged to join Infinity Inc! I bet Wonder Woman's purple ray cured him or something!

Little known fact, Superboy's costar, the Judy Garland of Space, was actually Yera in disguise!

There's also one with an alien "chameleon" pet!

Meh, they're all weak copies of Superman's original big brother, Halk Kar!

http://www.legionwiki.com/wiki/index.php?title=Superman_v1_80
http://www.legionwiki.com/wiki/index.php?title=Halk_Kar

Actually, this big brother appears to precede Halk Kar by about eight months!

Another cool thing:

This issue contains the story that was adapted into the pilot for the Superboy tv series of the 60s!