Why Did 'Supergirl' Change the Ending of 'Woman of Tomorrow'?

Here's Why 'Supergirl' Ends and Sounds Like That

Supergirl diverts from Woman of Tomorrow: Kara kills Krem instead of Phantom Zone imprisonment in the source material, and producers weighed 45 song options for the action sequence. The narrative shift establishes Supergirl's independent moral agency distinct from Superman's ethical constraints, signaling character autonomy through willingness to act lethally.