An alien parasite is uncovered in the Arctic ice and infects a climate scientist, who feeds on Supergirl’s powers — pressing James to seize his own heroic destiny. Meanwhile Alex decides to share her secret with Kara, and Mon-El takes up a less than desirable new career.

U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.

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THE GUARDIAN DEBUTS IN NATIONAL CITY

The Guardian debuts to lend a hand after a parasite alien drains Supergirl (Melissa Benoist) of her power. Mon-El (Chris Wood) considers a less than desirable new career which then leads him to contemplate his motives. Alex (Chyler Leigh) struggles with a new reality.