Issue 17
Superboy and the Legion of Super-Heroes (1977-) #247
Tharok plans to remake Corvan IV the way the Fatal Five wants it, but the Legion steps in.
Creators

From
Superboy and the Legion of Super-Heroes (1977-) Series
Tharok plans to remake Corvan IV the way the Fatal Five wants it, but the Legion steps in.

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