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Supergirl -- "Tremors" -- Image Number: SPG507A_0043b.jpg -- Pictured: Melissa Benoist as Kara/Supergirl -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507A_0105b.jpg -- Pictured: Katie McGrath as Lena Luthor -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507A_0187b.jpg -- Pictured: Katie McGrath as Lena Luthor -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507A_0242b.jpg -- Pictured: Katie McGrath as Lena Luthor -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507A_0266b.jpg -- Pictured: Katie McGrath as Lena Luthor -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507A_0282b.jpg -- Pictured: Katie McGrath as Lena Luthor -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507A_0297b.jpg -- Pictured: Melissa Benoist as Kara/Supergirl -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507A_0345b.jpg -- Pictured: Melissa Benoist as Kara/Supergirl -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507B_0007b.jpg -- Pictured (L-R): Chyler Leigh as Alex Danvers and Jesse Rath as Brainiac-5 -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507B_0022b.jpg -- Pictured (L-R): Chyler Leigh as Alex Danvers and Jesse Rath as Brainiac-5 -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507B_0045b.jpg -- Pictured (L-R): Jesse Rath as Brainiac-5 and Chyler Leigh as Alex Danvers -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507B_0122b.jpg -- Pictured: Chyler Leigh as Alex Danvers -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507B_0277b.jpg -- Pictured (L-R): Chyler Leigh as Alex Danvers and Azie Tesfai as Kelly Olsen -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507B_0291b.jpg -- Pictured (L-R): Chyler Leigh as Alex Danvers and Azie Tesfai as Kelly Olsen -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507A_0335b.jpg -- Pictured (L-R): Mitch Pileggi as Rama Khan and Melissa Benoist as Kara/Supergirl -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Tremors" -- Image Number: SPG507A_0360b.jpg -- Pictured: Mitch Pileggi as Rama Khan -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.