The Flash -- " The Runaway Dinosaur" -- Image: FLA221a_0027b.jpg -- Pictured: Jesse L. Martin as Detective Joe West -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221a_0070b.jpg -- Pictured: Jesse L. Martin as Detective Joe West -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221a_0109b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Jesse L. Martin as Detective Joe West -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221a_0172b.jpg -- Pictured (L-R): Michelle Harrison as Nora Allen and Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221a_0180b.jpg -- Pictured: Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221a_0203b.jpg -- Pictured: Michelle Harrison as Nora Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221a_0241b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Michelle Harrison as Nora Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221a_0255b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and Michelle Harrison as Nora Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221a_bts_0298b.jpg -- Pictured: Jesse L. Martin as Detective Joe West -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221a_bts_0300b.jpg -- Pictured (L-R): Behind the scenes with Grant Gustin as Barry Allen and Kevin Smith -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221a_bts_0305b.jpg -- Pictured: Behind the scenes with Kevin Smith -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221b_0014b.jpg -- Pictured (L-R): Grant Gustin as Barry Allen and John Wesley Shipp as Henry Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221b_0063b.jpg -- Pictured: Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserve.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221b_0083b.jpg -- Pictured (L-R): John Wesley Shipp as Henry Allen and Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221b_0142b.jpg -- Pictured (L-R): Candice Patton as Iris West and Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221b_0176b.jpg -- Pictured: Candice Patton as Iris West -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221b_0185b.jpg -- Pictured (L-R): Candice Patton as Iris West and Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221b_0206b.jpg -- Pictured: Grant Gustin as Barry Allen -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.

The Flash -- " The Runaway Dinosaur" -- Image: FLA221b_bts_0320b.jpg -- Pictured (L-R): Behind the scenes with Grant Gustin as Barry Allen, Candice Patton as Iris West and Kevin Smith -- Photo: Katie Yu/The CW -- © 2016 The CW Network, LLC. All rights reserved.