Kara (Laura Vandervoort) is Clark Kent's (Tom Welling) cousin from the planet Krypton. She had been trapped in suspended animation in her spaceship under a dam for 18 years after the first meteor shower in Smallville. When the dam broke, she was released and began to look for the cousin she had been sent to protect, not realizing 18 years had passed. In order to save Lana Lang (Kristin Kreuk) from the villain Brainiac (James Marsters), Kara agrees to help him look for a way to restore Kryton and enters hyperspace with him.
Kara ends up being trapped in the Phantom Zone, a Kryptonian prison while Brainac impersonates her on earth. She is rescued by Clark but later leaves Earth to search for Kandor after hearing that the city had survived the destruction of Krypton.
"We don't have time to wait for ancient technology. Between the two of us, we can cover more ground. Of course, it would help if you could defy gravity. Explain to me again why you can't fly."