Night Girl is a fictional character appearing in media published by DC Comics, primarily as a member of the Legion of Super-Heroes and Legion of Substitute Heroes in the 30th and 31st centuries. She first appeared in Adventure Comics #306.
Night Girl as depicted in Adventure Comics #524 (2011).
Cosmic Boy is a superhero appearing in comics published by DC Comics. He is from the 31st century, and is a founding member and original leader of the Legion of Super-Heroes.
Cover art for Final Crisis: Legion of Three Worlds #3 (February 2009), art by George Pérez.
Cosmic Boy #1 (December 1986), art by Steve Lightle.
Part of the cover art for Legion of Super-Heroes vol. 5, #9 (October 2005), art by Barry Kitson.
Ryan Kennedy as Rokk/Cosmic Boy on Smallville.