Kara got an adversary at work and she got demoted to assistant number 2. Meanwhile she got a friend from her planet acting as a killer to all criminals.
Since the friend was a prison guard and turns out believed in Kara’s mother’s methods and wanted to execute all krypton escapees to not cause more chaos.
Kara wouldn’t agree with his methodology this decided to stop him and giving us another meaningless and plotless episode.
The only interesting part was how they let Maxwell leave and the new project that the mothers hologram decided to self destruct.