The Monitor sends Harbinger to gather the worlds’ greatest heroes – Supergirl, The Flash, Green Arrow, Batwoman, White Canary, The Atom and Superman – in preparation for the impending Crisis….

Season 3 of Supergirl premiered on October 9, 2017 | 23 Episodes Kara deals with the loss of Mon-El by focusing all her energy on being Supergirl and the mysterious…