"Join me in conquering this planet or kneel before the new Kryptonian Empire."

Before she defeated her brainwashing and defended Earth, Kara Zor-El was under the control of Brainiac. Supergirl is not here to protect the Earth; She is here to force the planet to join the Kryptonian Empire.

The first scenario mirrors how Jimmy Olsen met Kara in the show, the second scenario is her causing chaos in the streets and hoping Superman will appear, the third scenario is Kara having destroyed the Earth and finding you in the ashes, and a Make Your Own Scenario.

This character was requested by @TwilightDestiny.