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.
Did You Know?
In real life, Erica Durance, who plays Kara's mother Alura, is only 10 years older than Melissa Benoist, who plays Kara/Supergirl. However, Alura only appears in dreams, flashbacks and holograms since Kara hasn't seen her mom since she was only 13 years old, and Alura was presumed dead after the destruction of planet Krypton. Therefore it makes sense for Alura to remain unaged in Kara's memories of her. Also, in season 2 it was mentioned by Kal-El (Superman) that Kryptonians age a lot slower than humans. See more
Winn says he cannot track where an explosion is coming from because "the radar is not picking up any underwater signals." Radar does not work underwater. See more
We are. They'll literally never see it coming.
That's the idea.