10 Best Action Set Pieces In The Arrowverse

10. Kara Goes Up Against A Worldkiller - Supergirl Season 3, Episode 9

Supergirl’s third season pitted the Maid of Might against Reign, a being born of Kryptonian sorcery that was fated to destroy the world, hence its secondary title: The Worldkiller.

The first eight episodes revealed that Samantha Arias was the alien destroyer’s human disguise, and each episode showcased her gradual descent into her worst primal instincts. This was despite the best efforts of Arias to regain control and avoid indulging her base tendencies.

All this came to a head in the ninth episode when Kara first encountered the villain in a spectacular clash with a level of scale that has not been seen in the series before and after the episode's release.

It was clear from the onset that Reign was Kara’s physical superior, and all the latter's own physical prowess and fighting skill could do was delay the inevitable. The battle reaches its boiling point in downtown National City and here audiences saw Kara at her most determined, despite being physically broken by the Worldkiller.