Supergirl (2015)

S03E01 Girl of Steel

Struggling with Mon-El's absence, Kara immerses herself in her role as Supergirl, tackling a new enigmatic danger looming over National City. Meanwhile, Alex opens up to Maggie about a secret regarding their upcoming wedding. A resident of National City reveals an intriguing link to Kara, prompting Lena to take a daring step forward.