Arrow -- "Lost in the Flood" -- Image AR422a_0009b.jpg -- Pictured (L-R): Emily Bett Rickards as Felicity Smoak and Paul Blackthorne as Detective Quentin Lance -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422a_0039b.jpg -- Pictured (L-R): Tom Amandes as Noah Kuttler/Calculator and Emily Bett Rickards as Felicity Smoak -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422a_0118b.jpg -- Pictured (L-R): Tom Amandes as Noah Kuttler/Calculator, Emily Bett Rickards as Felicity Smoak and Echo Kellum as Curtis Holt -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422a_0129b2.jpg -- Pictured (L-R): Tom Amandes as Noah Kuttler/Calculator and Emily Bett Rickards as Felicity Smoak -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422a_0143b.jpg -- Pictured: Echo Kellum as Curtis Holt -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422a_0236b.jpg -- Pictured (L-R): Tom Amandes as Noah Kuttler/Calculator, Charlotte Ross as Donna Smoak, Emily Bett Rickards as Felicity Smoak and Echo Kellum as Curtis Holt -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422a_0248b.jpg -- Pictured (L-R): Tom Amandes as Noah Kuttler/Calculator, Charlotte Ross as Donna Smoak and Emily Bett Rickards as Felicity Smoak -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422a_0300b.jpg -- Pictured: Tom Amandes as Noah Kuttler/Calculator -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422a_0313b.jpg -- Pictured (L-R): Charlotte Ross as Donna Smoak and Emily Bett Rickards as Felicity Smoak -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422a_0437b.jpg -- Pictured (L-R): Echo Kellum as Curtis Holt, Emily Bett Rickards as Felicity Smoak and Tom Amandes as Noah Kuttler/Calculator -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422a_0457b.jpg -- Pictured: Charlotte Ross as Donna Smoak -- Photo: Dean Buscher/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422b_0027b.jpg -- Pictured (L-R): Stephen Amell as Green Arrow and Willa Holland as Thea Queen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422b_0042b.jpg -- Pictured: Stephen Amell as Green Arrow -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422b_0150b.jpg -- Pictured: Willa Holland as Thea Queen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422b_0157b.jpg -- Pictured: Willa Holland as Thea Queen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422b_0203b.jpg -- Pictured: Stephen Amell as Green Arrow -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422b_0322b.jpg -- Pictured (L-R): John Barrowman as Malcolm Merlyn and Willa Holland as Thea Queen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422b_0335b.jpg -- Pictured: Stephen Amell as Green Arrow -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.

Arrow -- "Lost in the Flood" -- Image AR422b_0381b.jpg -- Pictured: Stephen Amell as Green Arrow -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All Rights Reserved.