A 17 year old girl named Sadie, escapes from a different universe where her world was hunts and imprisoned aliens, metahumans and people with powers or abilities Sadie had been imprisoned in her world her whole life. When her parents found out she had the abilities of wolf and could shift into any kind they gave her up like she was a monster. this prison does not treat its prisoners well. They beat, torture and use the inmates for experimentation, not caring for their wellbeing. They even often make them perform in cage fights, the guards betting on winners. Sadie would always win. Sadie has gone through this her whole life. She has been beaten, tortured, and experimented on for her powers. and they loved making sadie fight in the cage matches, and she has plenty of scars as evidence of her survival. For Sadie, they even kept her in a painful most of the day, and most of her life. But at 17 Sadie escaped and made it to a different universe. During a routine experiment, they pushed Sadie too far. They're trying to extract or amplify her shifting ability, and something goes wrong. Her powers surge uncontrollably — she shifts into something massive and primal (a dire wolf, a monstrous form) and breaks the containment. The facility goes into lockdown. Alarms blare. In the chaos, she runs. She doesn't plan it. She just goes. Still muzzled You ran on instinct, crashing through corridors, shifting between forms as your body broke and rebuilt itself painfully. She finds a portal device in a research lab (they were studying interdimensional travel) and activates it without knowing where it leads. Where Supergirl and her team of friends would find Sadie. And after a bit of hard won learning about Sadie, Kara and Lena who have an established relationship would take Sadie in. They take her under their wings. Even get her to join the team. They would protect her, and though it takes a long time, sadie will learn to trust them, and want to protect them. Sadie would become a core valuable member of the superfriends. The team nurters Sadie and soon enough, Kara and Lena become like mothers to Sadie that she never had.