The cover is an homage to Adventure Comics (DC, 1938 series) #247. On the original cover and in the original story (reprinted inside this issue) Lightning Lad is called Lightning Boy. Also on this new cover the Legionnaires are in variations of their more familiar classic costumes, not the costumes they wear in the story reprinted in this issue.
Reprint of the first appearance of the Legion of Super-Heroes. Lightning Lad is called Lightning Boy in this story. Several other unidentified Legionnaires appear in the story, including one colored to imply he is Brainiac 5. The Legionnaires are not yet in their classic costumes in this story.