In The Lost Sister, El continues her journey of self discovery with a trip to Chicago to find her psychic sister, 008/Kali. The sisters lost each other when Brenner separated them after Terry’s aborted rescue attempt. The episode is a stand alone featuring El’s storyline by itself.
We watch El learn about herself and face decisions about what kind of person she wants to be. She’s been physically lost since she left the lab, and a lost soul for her entire life. Kali is the same. They help each other begin to be found in ways that could only happen with each other.
As the episode begins, El is still wearing the blindfold and psychically communicating with her mother. She’s been there since the end of episode 5, so you would think she’d have gotten more than the repeating story of how Terry lost her mind, but she hasn’t.
El describes the visions to Becky over lunch, focussing on the other little girl behind the door with the rainbow. Becky suggests that El look through Terry’s files of missing children that she thought might be like El. El finds an article about Kali with a photo. El puts the blindfold back on and sits in front of the staticky TV, but she can’t find Kali.