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Supergirl -- "Crisis on Infinite Earths: Part One" -- Image Number: SPG509b_0207r.jpg -- Pictured (L-R): Stephen Amell as Oliver Queen/Green Arrow and Katherine McNamara as Mia -- Photo: Katie Yu/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Crisis on Infinite Earths: Part One" -- Image Number: SPG509b_0276r.jpg -- Pictured (L-R): Tyler Hoechlin as Clark Kent/Superman and Stephen Amell as Oliver Queen/Green Arrow -- Photo: Katie Yu/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Crisis on Infinite Earths: Part One" -- Image Number: SPG509b_0347r.jpg -- Pictured (L-R): Ruby Rose as Kate Kane/Batwoman and Brandon Routh as Ray Palmer/Atom -- Photo: Katie Yu/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Crisis on Infinite Earths: Part One" -- Image Number: SPG509b_0410r.jpg -- Pictured (L-R): Grant Gustin as The Flash, Audrey Marie Anderson as Harbinger, Caity Lotz as Sara Lance/White Canary and Brandon Routh as Ray Palmer/Atom -- Photo: Katie Yu/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Crisis on Infinite Earths: Part One" -- Image Number: SPG509c_0046r.jpg -- Pictured: Stephen Amell as Oliver Queen/Green Arrow -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Crisis on Infinite Earths: Part One" -- Image Number: SPG509c_0128r.jpg -- Pictured (L-R): Ruby Rose as Kate Kane/Batwoman, Tyler Hoechlin as Clark Kent/Superman and Brandon Routh as Ray Palmer/Atom -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Crisis on Infinite Earths: Part One" -- Image Number: SPG509c_0168r.jpg -- Pictured (L-R): Tyler Hoechlin as Clark Kent/Superman and Grant Gustin as The Flash -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

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Supergirl -- "Crisis on Infinite Earths: Part One" -- Image Number: SPG509c_0258r.jpg -- Pictured: Ruby Rose as Kate Kane/Batwoman -- Photo: Dean Buscher/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.