Mon-El was unwilling for most of the episode, although Saturn Girl was sympathetic and Brainiac 5 was becoming fast friends with Kara inside of her head.
The combined forces Mon-El, Saturn Girl, Brainiac 5, J’onn, and Supergirl by the end managed to do enough damage to Reign that she had to retreat and recover.
With Supergirl down for the count, the DEO attempted to recruit the Legion of Super-Heroes for help.
“Legion of Super-Heroes” was a rough one for National City as Reign killed everybody who she deemed was denying justice, which included criminals as well as law enforcement.