Supergirl -- "Changing" -- Image SPG206a_0012 -- Pictured (L-R): Melissa Benoist as Kara and Chyler Leigh as Alex Danvers -- Photo: Liane Hentscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206a_0103 -- Pictured (L-R): Chyler Leigh as Alex Danvers and Melissa Benoist as Kara -- Photo: Liane Hentscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206a_0264 -- Pictured: William Mapother as Dr. Rudy Jones -- Photo: Liane Hentscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206a_0286 -- Pictured: Melissa Benoist as Kara/Supergirl -- Photo: Liane Hentscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206a_0321 -- Pictured (L-R): William Mapother as Dr. Rudy Jones, Melissa Benoist as Kara/Supergirl, Jason Gray-Stanford as Rand O'Reilly -- Photo: Liane Hentscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206a_0394 -- Pictured: Melissa Benoist as Kara/Supergirl -- Photo: Liane Hentscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206b_0108 -- Pictured: Melissa Benoist as Kara/Supergirl -- Photo: Bettina Strauss /The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206b_0116 -- Pictured: Melissa Benoist as Kara/Supergirl -- Photo: Bettina Strauss /The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206b_0137 -- Pictured: Melissa Benoist as Kara/Supergirl -- Photo: Bettina Strauss /The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206b_0151 -- Pictured: Melissa Benoist as Kara/Supergirl -- Photo: Bettina Strauss /The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206b_0158 -- Pictured (L-R): Mehcad Brooks as James Olsen / Guardian and Chris Wood as Mike/Mon-El -- Photo: Bettina Strauss /The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206b_0166 -- Pictured: Mehcad Brooks as James Olsen / Guardian -- Photo: Bettina Strauss /The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206b_0188 -- Pictured (L-R): Melissa Benoist as Kara/Supergirl and Chris Wood as Mike/Mon-El -- Photo: Bettina Strauss /The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206b_0193 -- Pictured (L-R): Mehcad Brooks as James Olsen / Guardian, Chris Wood as Mike/Mon-El, and Melissa Benoist as Kara/Supergirl -- Photo: Bettina Strauss /The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206c_0059 -- Pictured (L-R): Mehcad Brooks as James Olsen / Guardian and Chris Wood as Mike/Mon-El -- Photo: Bettina Strauss /The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206c_0064 -- Pictured: Mehcad Brooks as James Olsen / Guardian -- Photo: Bettina Strauss /The CW -- © 2016 The CW Network, LLC. All Rights Reserved

Supergirl -- "Changing" -- Image SPG206c_0102 -- Pictured: Chris Wood as Mike/Mon-El -- Photo: Bettina Strauss /The CW -- © 2016 The CW Network, LLC. All Rights Reserved