Adventure Comics # 317 - The Menace Of Dream Girl!

Dream Girl shows up to save the Legion of Super-Heroes from a spaceship explosion she has seen in one of her futuristic visions. To do so, she joins the Legion and begins to suspend various Legionnaires for many infractions. Dream Girl's reason for the suspensions are finally revealed and the Legionnaires forgive her, but she decides to leave the team anyway since she joined by a trick and may join in the future. Also, Lightning Lass's powers have changed, thanks to Dream Girl and her superior knowledge of science, and she can make things lighter. Her new name is Light Lass.