In Supergirl: Cosmic Adventures in the 8th Grade, Lena Thorul appears as a little girl attending the same high school as Supergirl. She appears to be a budding scientist.
She was nice, and a good friend; however, she was sensitive and easily angered, using her scientific prowess to do things such as removing everyone's meteor-given superpowers.
Lena Thorul is a main character in the series. She is Lex Luthor's thirteen-year-old sister who attends the same boarding school as Supergirl. Lena hates superheroes, and specifically blames Supergirl for the recent misfortune that has befallen her brother (in the first issue Supergirl was accidentally responsible for Lex Luthor's capture). Unaware that Linda Lee is really Supergirl just as Linda is unaware that Lena Thorul is related to Lex Luthor, the two become best friends and roommates. Though sweet and fun when interacting with Linda (who Lena perceives as an outsider just like herself), Lena is hostile and suspicious towards everyone else. This is particularly true in regards to Linda's evil doppelganger Belinda Zee (Superiorgirl).
As the series progresses, Lena's xenophobia becomes increasingly apparent. It is revealed that Lena is in secret communication with her older brother, waiting for the correct time to enact a complicated revenge scheme against Superman. When Linda'a identity is inadvertently exposed to Lena by the time-lost duplicate of Supergirl known as Supragirl, Lena goes over the edge and takes control of the minds of half the students in the school (the other half being transformed into Bizzaro's by SuperiorGirl).
Lena begins to question her hatred when confronted by the manipulations of reality by Mxyzptlk and by Supergirl's willingness to save all of reality from the 5th dimensional imp. While Supergirl is battling Mxyzptlk, Lena is critically injured. Supergirl forces a truce between Luthor and Superman so that they can save Lena. Luthor saves his little sister, but the cost of her survival is that her hatred is now directed at her own brother.
At the series end, Lena is referenced to be recovering in the hospital.
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