Supergirl -- "The Fanatical" -- Image Number: SPG319a_0006.jpg -- Pictured: Odette Annable as Samantha Arias/Reign -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0014.jpg -- Pictured (L-R): Melissa Benoist as Kara/Supergirl, Jeremy Jordan as Winn Schott, David Harewood as Hank/J'onn and Chris Wood as Mon-El -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0032.jpg -- Pictured (L-R): Chris Wood as Mon-El, David Harewood as Hank/J'onn and Melissa Benoist as Kara/Supergirl -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0054.jpg -- Pictured (L-R): Jeremy Jordan as Winn Schott and David Harewood as Hank/J'onn -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0097.jpg -- Pictured: Odette Annable as Samantha Arias/Reign -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0106.jpg -- Pictured: Odette Annable as Samantha Arias/Reign -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0131.jpg -- Pictured (L-R): Jeremy Jordan as Winn Schott, Katie McGrath as Lena Luthor and Melissa Benoist as Kara/Supergirl -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0181.jpg -- Pictured (L-R): Odette Annable as Samantha Arias/Reign, Chris Wood as Mon-El, Katie McGrath as Lena Luthor, Melissa Benoist as Kara/Supergirl and David Harewood as Hank/J'onn -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0186.jpg -- Pictured (L-R): Chris Wood as Mon-El, Katie McGrath as Lena Luthor, Melissa Benoist as Kara/Supergirl, David Harewood as Hank/J'onn and Jeremy Jordan as Winn Schott -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0215.jpg -- Pictured (L-R): Chris Wood as Mon-El, Melissa Benoist as Kara/Supergirl, Jeremy Jordan as Winn Schott, Katie McGrath as Lena Luthor and Odette Annable as Samantha Arias/Reign -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0226.jpg -- Pictured: Katie McGrath as Lena Luthor -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0231.jpg -- Pictured (L-R): Jeremy Jordan as Winn Schott, Melissa Benoist as Kara/Supergirl and Katie McGrath as Lena Luthor -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319a_0257.jpg -- Pictured (L-R): Chris Wood as Mon-El and Jeremy Jordan as Winn Schott -- Photo: Dean Buscher/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319b_0086.jpg -- Pictured (L-R): Mehcad Brooks as James Olsen/Guardian and Nesta Cooper as Tanya -- Photo: Cate Cameron/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319b_0094.jpg -- Pictured: Mehcad Brooks as James Olsen/Guardian -- Photo: Cate Cameron/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.

Supergirl -- "The Fanatical" -- Image Number: SPG319b_-134.jpg -- Pictured (L-R): Mehcad Brooks as James Olsen/Guardian and Melissa Benoist as Kara/Supergirl -- Photo: Cate Cameron/The CW -- © 2018 The CW Network, LLC. All Rights Reserved.