Supergirl -- "Triggers" -- SPG302_SG_0106238.jpg -- Pictured: Yael Grobglas as Psi -- Photo: The CW -- © 2017 The CW Network, LLC. All Rights Reserved

Supergirl -- "Triggers" -- SPG302_SG_0128318.jpg -- Pictured: Yael Grobglas as Psi -- Photo: The CW -- © 2017 The CW Network, LLC. All Rights Reserved

Supergirl -- "Triggers" -- SPG302_SG_0130246.jpg -- Pictured: Yael Grobglas as Psi -- Photo: The CW -- © 2017 The CW Network, LLC. All Rights Reserved

Supergirl -- "Triggers" -- SPG302_SG_0132056.jpg -- Pictured: Yael Grobglas as Psi -- Photo: The CW -- © 2017 The CW Network, LLC. All Rights Reserved

Supergirl -- "Triggers" -- SPG302_SG_0136348.jpg -- Pictured (L-R): Yael Grobglas as Psi and Melissa Benoist as Kara/Supergirl -- Photo: The CW -- © 2017 The CW Network, LLC. All Rights Reserved

Supergirl -- "Triggers" -- SPG302a_0002.jpg -- Pictured: Odette Anabele as Samantha -- Photo: Robert Falconer/The CW -- © 2017 The CW Network, LLC. All Rights Reserved

Supergirl -- "Triggers" -- SPG302a_0005.jpg -- Pictured: Odette Anabele as Samantha -- Photo: Robert Falconer/The CW -- © 2017 The CW Network, LLC. All Rights Reserved

Supergirl -- "Triggers" -- SPG302a_0031.jpg -- Pictured: Emma Tremblay as Ruby -- Photo: Robert Falconer/The CW -- © 2017 The CW Network, LLC. All Rights Reserved

Supergirl -- "Triggers" -- SPG302a_0052.jpg -- Pictured (L-R): Odette Anabele as Samantha and Emma Tremblay as Ruby -- Photo: Robert Falconer/The CW -- © 2017 The CW Network, LLC. All Rights Reserved