Issue 16
Superboy and the Legion of Super-Heroes (1977-) #246
People are disappearing on Mercury, and the Legion tries to get to the bottom of things.
Creators

From
Superboy and the Legion of Super-Heroes (1977-) Series
People are disappearing on Mercury, and the Legion tries to get to the bottom of things.

From
Superboy and the Legion of Super-Heroes (1977-) Series