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The Flash -- "Who is Harrison Wells?" -- Image FLA119A_0060b -- Pictured: Rick Cosnett as Detective Eddie Thawne -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119A_0081b -- Pictured (L-R): Grant Gustin as Barry Allen and Rick Cosnett as Detective Eddie Thawne -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119A_0088b -- Pictured (L-R): Rick Cosnett as Detective Eddie Thawne and Grant Gustin as Barry Allen -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119A_0135b -- Pictured (L-R): Grant Gustin as Barry Allen and Rick Cosnett as Detective Eddie Thawne -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119A_0156b -- Pictured: Rick Cosnett as Detective Eddie Thawne -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119A_0266b -- Pictured (L-R): Jesse L. Martin as Detective Joe West, Grant Gustin as Barry Allen, Danielle Panabaker as Caitlin Snow, and Carlos Valdes as Cisco Ramon -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119A_0332b -- Pictured (L-R): Jesse L. Martin as Detective Joe West and Grant Gustin as Barry Allen -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119A_0334b-- Pictured (L-R): Jesse L. Martin as Detective Joe West and Grant Gustin as Barry Allen -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119B_0012b -- Pictured (L-R): Carlos Valdes as Cisco Ramon and Katie Cassidy as Laurel Lance -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119B_0016b -- Pictured: Carlos Valdes as Cisco Ramon -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119B_0075b -- Pictured (L-R): Carlos Valdes as Cisco Ramon and Katie Cassidy as Laurel Lance -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119B_0190b -- Pictured (L-R): Jesse L. Martin as Detective Joe West, Carlos Valdes as Cisco Ramon, and Paul Blackthorne as Quentin Lance -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119B_0206b -- Pictured (L-R): Paul Blackthorne as Quentin Lance, Jesse L. Martin as Detective Joe West, Carlos Valdes as Cisco Ramon, and Katie Cassidy as Laurel Lance -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved

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The Flash -- "Who is Harrison Wells?" -- Image FLA119B_0272b -- Pictured: Carlos Valdes as Cisco Ramon -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119B_0275b -- Pictured (L-R): Jesse L. Martin as Detective Joe West and Carlos Valdes as Cisco Ramon -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119B_0321b -- Pictured (L-R): Jesse L. Martin as Detective Joe West and Paul Blackthorne as Quentin Lance -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119B_0342b -- Pictured (L-R): Jesse L. Martin as Detective Joe West and Paul Blackthorne as Quentin Lance -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119B_0372b -- Pictured (L-R): Carlos Valdes as Cisco Ramon and Katie Cassidy as Laurel Lance -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.

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The Flash -- "Who is Harrison Wells?" -- Image FLA119B_0411b -- Pictured (L-R): Carlos Valdes as Cisco Ramon and Katie Cassidy as Laurel Lance -- Photo: Katie Yu /The CW -- © 2015 The CW Network, LLC. All rights reserved.