Superboy, Vol. 1 #176 (1971)

The Secret of Superboy's "Sister" / Invisible Invader

The Secret of Superboy's "Sister" - The Kents adopt the girl of a family friend after a car accident, and an alien device Superboy brings home gives her super intellect. Will Superboy's secret be safe?

Invisible Invader - There is a theif around who can turn himself invisible. To learn how to stop him, the Legion may also be forced to reveal a means of stopping the Invisible Kid.

Release Date: 1971