Watch the Promo for Supergirl “Not Kansas”

The promo for the Season Finale of Supergirl has been released. The episode is called, “Not Kansas” and it will air this coming Monday, June 4.

In the episode, “Kara (Melissa Benoist) makes a major life decision. Meanwhile, J’onn (David Harewood) finds out that special DEO-caliber guns have hit the streets of National City.”

What did everyone think of tonight’s episode?

Source: CW