Watch Supergirl s3e1 online stream free.
Description by couchtuner for Supergirl Season 3 Episode 1 : Kara deals with the loss of Mon-El by focusing all her energy on being Supergirl and the mysterious new threat against National City. Alex confesses a secret to Maggie about their impending nuptials. A citizen of National City has a mysterious connection to Kara, and Lena makes a bold move.
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