One day at Midvale Orphanage, Linda Lee, aka Supergirl, is summoned to help Superman stop a bank robbery. He can't do so on his own because he's stuck as Clark Kent. After she helps him stop the thieves, she accidentally flies through the tail of a comet near Smallville. The comet is radioactive and makes her lose some of her memories, including her promise to keep Supergirl's existence a secret. She begins patrolling Smallville as Supergirl.
Meanwhile, she begins living with Professor Ralph Evans and his wife, Ellen. Despite their blindness, they both quickly figure out that their adoptive daughter, under the name of Gloria Smith, is really Supergirl. They suggest building a secret tunnel from their house for her to use to preserve her secret identity.
However, soon after Supergirl defeats a Robot Warrior, one of Superboy's conquests who had been stored in the Superboy museum, Superman appears and hits the entire town with amnesia gas so they would forget Supergirl exists. The gas was laced with Green Kryptonite, so it would affect Supergirl as well.
- Midvale Orphanage
- Ralph and Ellen Evans
- Robot Warrior
- Smallville, Kansas
- Bottle City of Kandor
- Superboy Museum
- Linda Lee robot
- Supergirl previously got adopted temporarily in "Supergirl's Foster Parents". However, those parents turned out to be swindlers. She got adopted again in "Supergirl Gets Adopted!", this time with good parents, but again temporary.
- Supergirl had previously visited Smallville when she traveled back through time to meet Superboy in "Superboy meets Supergirl!".