Season 02, Episode 08 – “Medusa”
A superhero crossover event begins with Barry Allen and Cisco Ramon from “The Flash” seeking Kara’s help with an alien invasion; at the same time, Eliza comes to town to celebrate Thanksgiving with her daughters, which seems like the perfect opportunity for Alex to come out to her mother. Meanwhile, Winn and James consider telling Kara the truth about the Guardian; and Kara wants to team up with Lena Luthor to combat a deadly virus unleashed by CADMUS.
Twenty-four-year-old Kara Zor-El, who was taken in by the Danvers family when she was 13 after being sent away from Krypton, must learn to embrace her powers after previously hiding them. The Danvers teach her to be careful with her powers, until she has to reveal them during an unexpected disaster, setting her on her journey of heroism.