Supergirl 4.04 Preview

**Supergirl 4.04 Preview: "Fallout"**

In an exclusive sneak peek from Monday's episode of The CW's Supergirl, Kara (Melissa Benoist) and Lena (Katie McGrath) try to make sense of the aftermath of last week's catastrophic explosion. As Kara investigates the ruins of CatCo, she discovers a mysterious symbol that could hold the key to the identity of the bomber. Meanwhile, Lena struggles to cope with the loss of her mother, Lillian (Brenda Strong), and begins to question her own beliefs. Watch the preview below to get a glimpse of the upcoming episode, titled "Fallout."

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