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Supergirl finds herself in a super team-up when a new superhero, The Flash, accidentally crosses dimensions and finds himself in Kara's universe. Together they have to battle Livewire and a new villainess, Silver Banshee.
A captive Hank tells the U.S government how he came to lead the DEO, but receives a less than sympathetic ear. Meanwhile, Kara reveals her identity to someone close to the investigation, and Siobhan plans revenge Kara for getting her fired from CatCo.
Kara must find a way to free her friends when Non and Indigo use mind control to turn National City's citizens into their own army.