Kara is attempting to work up the courage to tell Lena her secret when she learns that Lena sold CatCo while a mysterious shapeshifter summons one of J'onn's enemies from the Phantom Zone.
Season 5, Episode 1
Previous: “The Quest for Peace”
Next: “Stranger Beside Me”
Kara stops an out of control schoolbus and is then sees Lena who punches her all in Lena's simulation.
Kelly tells Kara, Alex, and J'onn about her new job over coffee and after she leaves Alex tries to convince Kara to come clean to Lena.
Kara finally comes clean to Lena just before Lena introduces her at the awards ceremony which is soon interrupted by Midnight.
Source: What's Filming